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Add IO register summary (#26)
Add IO register summary for easy browsability
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‎content/registers.md

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<h2 id="hardware-register-summary"><a class="header" href="#hardware-register-summary">
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Hardware Register Summary
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</a></h2>
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| Starting Address | Region name |
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|------------------|-------------|
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| 0x04000000 | [Display](#hardware-register-summary-display) |
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| 0x04000060 | [Sound](#hardware-register-summary-sound) |
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| | - [Alternative DMG Sound register names](#hardware-register-summary-sound-alt) |
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| 0x040000B0 | [DMA](#hardware-register-summary-dma) |
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| 0x04000100 | [Timers](#hardware-register-summary-timer) |
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| 0x04000120 | [Serial hardware control and data](#hardware-register-summary-serial) |
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| | - [Normal / SPI mode](#hardware-register-summary-serial-spi) |
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| | - [Multiplay mode](#hardware-register-summary-serial-multiplay) |
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| | - [UART mode](#hardware-register-summary-serial-uart) |
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| 0x04000130 | [Keypad button input and interrupt control](#hardware-register-summary-key) |
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| 0x04000134 | [Serial port mode and control](#hardware-register-summary-rcnt) |
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| 0x04000140 | [JOYBUS controller](#hardware-register-summary-joybus) |
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| 0x04000200 | [Interrupt controller](#hardware-register-summary-irq) |
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| | - [Cartridge slot waitstate and control](#hardware-register-summary-cartcnt) |
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| 0x04000300 | [System control](#hardware-register-summary-system) |
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<h3 id="hardware-register-summary-display"><a class="header" href="#hardware-register-summary-display">
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Display
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</a></h3>
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| Address | Name | Size | Description |
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|------------|---------------------------|------|-------------|
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| 0x04000000 | [DISPCNT](#REG_DISPCNT) | 16 | Display Control |
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| 0x04000002 | | 16 | Stereoscopic mode enable |
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| 0x04000004 | [DISPSTAT](#REG_DISPSTAT) | 16 | Display Status, display interrupt enable, Line Y Compare (LYC) |
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| 0x04000006 | [VCOUNT](#REG_VCOUNT) | 16 | Current display scanline position<br>(equivalent to LY on 8-bit Game Boy systems) |
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| 0x04000008 | [BG0CNT](#REG_BGCNT) | 16 | Background Control |
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| 0x0400000A | [BG1CNT](#REG_BGCNT) | ^^ | ^^ |
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| 0x0400000C | [BG2CNT](#REG_BGCNT) | ^^ | ^^ |
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| 0x0400000E | [BG3CNT](#REG_BGCNT) | ^^ | ^^
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| 0x04000010 | [BG0HOFS](#REG_BGOFS) | 16 | Background Scrolling |
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| 0x04000012 | [BG0VOFS](#REG_BGOFS) | ^^ | ^^ |
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| 0x04000014 | [BG1HOFS](#REG_BGOFS) | ^^ | ^^ |
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| 0x04000016 | [BG1VOFS](#REG_BGOFS) | ^^ | ^^ |
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| 0x04000018 | [BG2HOFS](#REG_BGOFS) | ^^ | ^^ |
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| 0x0400001A | [BG2VOFS](#REG_BGOFS) | ^^ | ^^ |
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| 0x0400001C | [BG3HOFS](#REG_BGOFS) | ^^ | ^^ |
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| 0x0400001E | [BG3VOFS](#REG_BGOFS) | ^^ | ^^ |
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| 0x04000020 | [BG2PA](#REG_BGPA) | 16 | Background Affine parameters for BG2 |
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| 0x04000022 | [BG2PB](#REG_BGPB) | 16 | ^^ |
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| 0x04000024 | [BG2PC](#REG_BGPC) | 16 | ^^ |
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| 0x04000026 | [BG2PD](#REG_BGPD) | 16 | ^^ |
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| 0x04000028 | [BG2X](#REG_BGX) | 32 | ^^ |
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| 0x0400002C | [BG2Y](#REG_BGY) | 32 | ^^ |
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| 0x04000030 | [BG3PA](#REG_BGPA) | 16 | Background Affine parameters for BG3 |
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| 0x04000032 | [BG3PB](#REG_BGPB) | 16 | ^^ |
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| 0x04000034 | [BG3PC](#REG_BGPC) | 16 | ^^ |
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| 0x04000036 | [BG3PD](#REG_BGPD) | 16 | ^^ |
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| 0x04000038 | [BG3X](#REG_BGX) | 32 | ^^ |
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| 0x0400003C | [BG3Y](#REG_BGY) | 32 | ^^ |
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| 0x04000040 | [WIN0H](#REG_WINH) | 16 | Window Bounds |
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| 0x04000042 | [WIN1H](#REG_WINH) | 16 | ^^ |
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| 0x04000044 | [WIN0V](#REG_WINV) | 16 | ^^ |
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| 0x04000046 | [WIN1V](#REG_WINV) | 16 | ^^ |
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| 0x04000048 | [WININ](#REG_WININ) | 16 | Window display inside of WIN0 and WIN1 |
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| 0x0400004A | [WINOUT](#REG_WINOUT) | 16 | Window display outside of WIN0 and WIN1,<br>and inside of OBJWIN |
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| 0x0400004C | [MOSAIC](#REG_MOSAIC) | 16 | Mosaic effect size |
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| 0x04000050 | [BLDCNT](#REG_BLDCNT) | 16 | Blend mode and target selection |
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| 0x04000052 | [BLDALPHA](#REG_BLDALPHA) | 16 | Blend alpha coefficients |
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| 0x04000054 | [BLDY](#REG_BLDY) | 16 | Blend luminance coefficient<br>for lightening and darkening |
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<h3 id="hardware-register-summary-sound"><a class="header" href="#hardware-register-summary-sound">
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Sound
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</a></h3>
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| Address | Name | Size | Description |
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|------------|--------------------------- |------|-------------|
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| 0x04000060 | [SOUND1CNT_L](#REG_SOUND1CNT_L) | 16 | DMG Sound Channel 1 |
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| 0x04000062 | [SOUND1CNT_H](#REG_SOUND1CNT_H) | 16 | ^^ |
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| 0x04000064 | [SOUND1CNT_X](#REG_SOUND1CNT_X) | 16 | ^^ |
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| 0x04000068 | [SOUND2CNT_L](#REG_SOUND2CNT_L) | 16 | DMG Sound Channel 2 |
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| 0x0400006C | [SOUND2CNT_H](#REG_SOUND2CNT_H) | 16 | ^^ |
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| 0x04000070 | [SOUND3CNT_L](#REG_SOUND3CNT_L) | 16 | DMG Sound Channel 3 |
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| 0x04000072 | [SOUND3CNT_H](#REG_SOUND3CNT_H) | 16 | ^^ |
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| 0x04000074 | [SOUND3CNT_X](#REG_SOUND3CNT_X) | 16 | ^^ |
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| 0x04000078 | [SOUND4CNT_L](#REG_SOUND4CNT_L) | 16 | DMG Sound Channel 4 |
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| 0x0400007C | [SOUND4CNT_H](#REG_SOUND4CNT_H) | 16 | ^^ |
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| 0x04000080 | [SOUNDCNT_L](#REG_SOUNDCNT_L) | 16 | DMG Sound master volume and pan |
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| 0x04000082 | [SOUNDCNT_H](#REG_SOUNDCNT_H) | 16 | GBA Sound volume mixing <br>and Direct Sound control |
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| 0x04000084 | [SOUNDCNT_X](#REG_SOUNDCNT_X) | 16 | Sound master enable<br>and DMG Sound channel status |
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| 0x04000088 | [SOUNDBIAS](#REG_SOUNDBIAS) | 16 | PWM bias and resolution |
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| 0x040000A0 | [FIFO_A](#REG_FIFO) | 32(!)| Direct Sound FIFO A |
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| 0x040000A4 | [FIFO_B](#REG_FIFO) | 32(!)| Direct Sound FIFO B |
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<h4 id="hardware-register-summary-sound-alt"><a class="header" href="#hardware-register-summary-sound-alt">
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Alternative DMG Sound register names
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</a></h4>
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| Address | Name | Description |
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|------------|--------------------------|-------------|
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| 0x04000060 | [NR10](#REG_SOUND1CNT_L) | DMG Sound Channel 1 |
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| 0x04000062 | [NR11](#REG_SOUND1CNT_H) | ^^ |
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| 0x04000063 | [NR12](#REG_SOUND1CNT_H) | ^^ |
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| 0x04000064 | [NR13](#REG_SOUND1CNT_X) | ^^ |
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| 0x04000065 | [NR14](#REG_SOUND1CNT_X) | ^^ |
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| 0x04000068 | [NR21](#REG_SOUND2CNT_L) | DMG Sound Channel 2 |
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| 0x04000069 | [NR22](#REG_SOUND2CNT_L) | ^^ |
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| 0x0400006C | [NR23](#REG_SOUND2CNT_H) | ^^ |
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| 0x0400006D | [NR24](#REG_SOUND2CNT_H) | ^^ |
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| 0x04000070 | [NR30](#REG_SOUND3CNT_L) | DMG Sound Channel 3 |
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| 0x04000072 | [NR31](#REG_SOUND3CNT_H) | ^^ |
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| 0x04000073 | [NR32](#REG_SOUND3CNT_H) | ^^ |
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| 0x04000074 | [NR33](#REG_SOUND3CNT_X) | ^^ |
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| 0x04000075 | [NR34](#REG_SOUND3CNT_X) | ^^ |
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| 0x04000078 | [NR41](#REG_SOUND4CNT_L) | DMG Sound Channel 4 |
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| 0x04000079 | [NR42](#REG_SOUND4CNT_L) | ^^ |
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| 0x0400007C | [NR43](#REG_SOUND4CNT_H) | ^^ |
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| 0x0400007D | [NR44](#REG_SOUND4CNT_H) | ^^ |
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| 0x04000080 | [NR50](#REG_SOUNDCNT_L) | DMG Sound master volume |
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| 0x04000081 | [NR51](#REG_SOUNDCNT_L) | DMG Sound channel pan |
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| 0x04000084 | [NR52](#REG_SOUNDCNT_X) | Sound master enable and channel status |
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<h3 id="hardware-register-summary-dma"><a class="header" href="#hardware-register-summary-dma">
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DMA
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</a></h3>
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| Address | Name | Size | Description |
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|------------|----------------------------------|------|-------------|
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| 0x040000B0 | [DMA0SAD](#REG_DMA0SAD) | 32 | DMA Controller 0 |
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| 0x040000B4 | [DMA0DAD](#REG_DMA0DAD) | 32 | ^^ |
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| 0x040000B8 | [DMA0CNT_L](#REG_DMA0CNT_L) | 16 | ^^ |
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| 0x040000BA | [DMA0CNT_H](#REG_DMA0CNT_H) | 16 | ^^ |
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| 0x040000BC | [DMA1SAD](#REG_DMA1SAD) | 32 | DMA Controller 1 |
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| 0x040000C0 | [DMA1DAD](#REG_DMA0DAD) | 32 | ^^ |
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| 0x040000C4 | [DMA1CNT_L](#REG_DMA0CNT_L) | 16 | ^^ |
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| 0x040000C6 | [DMA1CNT_H](#REG_DMA0CNT_H) | 16 | ^^ |
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| 0x040000C8 | [DMA2SAD](#REG_DMA1SAD) | 32 | DMA Controller 2 |
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| 0x040000CC | [DMA2DAD](#REG_DMA0DAD) | 32 | ^^ |
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| 0x040000D0 | [DMA2CNT_L](#REG_DMA0CNT_L) | 16 | ^^ |
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| 0x040000D2 | [DMA2CNT_H](#REG_DMA0CNT_H) | 16 | ^^ |
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| 0x040000D4 | [DMA3SAD](#REG_DMA1SAD) | 32 | DMA Controller 3 |
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| 0x040000D8 | [DMA3DAD](#REG_DMA3DAD) | 32 | ^^ |
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| 0x040000DC | [DMA3CNT_L](#REG_DMA0CNT_L) | 16 | ^^ |
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| 0x040000DE | [DMA3CNT_H](#REG_DMA0CNT_H) | 16 | ^^ |
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<h3 id="hardware-register-summary-timer"><a class="header" href="#hardware-register-summary-timer">
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Timer
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</a></h3>
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| Address | Name | Size | Description |
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|------------|----------------------------------|------|-------------|
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| 0x04000100 | [TM0D](#REG_TMD) | 16 | Timer 0 |
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| 0x04000102 | [TM0CNT](#REG_TMCNT) | 16 | ^^ |
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| 0x04000104 | [TM1D](#REG_TMD) | 16 | Timer 1 |
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| 0x04000106 | [TM1CNT](#REG_TMCNT) | 16 | ^^ |
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| 0x04000108 | [TM2D](#REG_TMD) | 16 | Timer 2 |
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| 0x0400010A | [TM2CNT](#REG_TMCNT) | 16 | ^^ |
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| 0x0400010C | [TM3D](#REG_TMD) | 16 | Timer 3 |
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| 0x0400010E | [TM3CNT](#REG_TMCNT) | 16 | ^^ |
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<h3 id="hardware-register-summary-serial"><a class="header" href="#hardware-register-summary-serial">
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Serial peripherals
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</a></h3>
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See [Serial port mode and control](#hardware-register-summary-rcnt) to switch to the correct mode.
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<h4 id="hardware-register-summary-serial-spi"><a class="header" href="#hardware-register-summary-serial-spi">
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Normal / SPI
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</a></h4>
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| Address | Name | Size | Description |
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|------------|----------------------------------|------|-------------|
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| 0x04000128 | [SCCNT_L](#REG_SCCNT_L) | 16 | Serial peripheral mode, status, and control |
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| 0x0400012A | [SCCNT_H](#REG_SCCNT_H) | 8 | Serial data send and receive |
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<h4 id="hardware-register-summary-serial-multiplay"><a class="header" href="#hardware-register-summary-serial-multiplay">
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Multiplay
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</a></h4>
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| Address | Name | Size | Description |
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|------------|----------------------------------|------|-------------|
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| 0x04000120 | [SCD0](#REG_SCD) | 16 | Multiplay received data from master |
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| 0x04000122 | [SCD1](#REG_SCD) | 16 | Multiplay received data from slave 1 |
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| 0x04000124 | [SCD2](#REG_SCD) | 16 | Multiplay received data from slave 2 |
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| 0x04000126 | [SCD3](#REG_SCD) | 16 | Multiplay received data from slave 3 |
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| 0x04000128 | [SCCNT_L](#REG_SCCNT_L) | 16 | Serial peripheral mode, status, and control |
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| 0x0400012A | [SCCNT_H](#REG_SCCNT_H) | 16 | Multiplay transmit value |
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<h4 id="hardware-register-summary-serial-uart"><a class="header" href="#hardware-register-summary-serial-uart">
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UART
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</a></h4>
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| Address | Name | Size | Description |
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|------------|----------------------------------|------|-------------|
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| 0x04000128 | [SCCNT_L](#REG_SCCNT_L) | 16 | Serial peripheral mode, status, and control |
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| 0x0400012A | [SCCNT_H](#REG_SCCNT_H) | 8 | UART send (W) and receive (R) FIFO |
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<h3 id="hardware-register-summary-key"><a class="header" href="#hardware-register-summary-key">
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Keypad
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</a></h3>
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| Address | Name | Size | Description |
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|------------|----------------------------------|------|-------------|
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| 0x04000130 | [KEYINPUT](#REG_KEYINPUT) | 16 | Keypad input |
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| 0x04000132 | [KEYCNT](#REG_KEYCNT) | 16 | Keypad wake and interrupt control |
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<h3 id="hardware-register-summary-rcnt"><a class="header" href="#hardware-register-summary-rcnt">
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Serial port (EXT.) control
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</a></h3>
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| Address | Name | Size | Description |
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|------------|----------------------------------|------|-------------|
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| 0x04000134 | [RCNT](#REG_RCNT) | 16 | Port mode control,<br>GPIO direction and value,<br>GPIO interrupt enable |
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<h3 id="hardware-register-summary-joybus"><a class="header" href="#hardware-register-summary-joybus">
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JOYBUS
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</a></h3>
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> TODO: JOYBUS is not explored enough yet to be documented here.
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<h3 id="hardware-register-summary-irq"><a class="header" href="#hardware-register-summary-irq">
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Interrupts
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</a></h3>
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| Address | Name | Size | Description |
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|------------|----------------------------------|------|-------------|
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| 0x04000200 | [IE](#REG_IE) | 16 | Interrupt enable selection |
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| 0x04000202 | [IF](#REG_IF) | 16 | Interrupt status and acknowledge |
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| 0x04000208 | [IME](#REG_IME) | 32 | Interrupt Master Enable |
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<h3 id="hardware-register-summary-cartcnt"><a class="header" href="#hardware-register-summary-cartcnt">
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Cartridge slot control
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</a></h3>
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| Address | Name | Size | Description |
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|------------|----------------------------------|------|-------------|
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| 0x04000204 | [WAITCNT](#REG_WAITCNT) | 16 | Cartridge waitstate control,<br>clock output,<br>prefetch enable,<br>and cartridge shape status |
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<h3 id="hardware-register-summary-system"><a class="header" href="#hardware-register-summary-system">
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System control
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</a></h3>
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| Address | Name | Size | Description |
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|------------|----------------------------------|------|-------------|
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| 0x04000300 | [HALTCNT](#REG_HALTCNT) | 16 | Low-power mode control<br>and boot flag status |
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| 0x04000800 | | 32 | (Only on AGB, AGS, GBP, and OXY)<br>Test mode control |
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<h2 id="graphics-hardware-registers"><a class="header" href="#graphics-hardware-registers">
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0x04000000 - 0x04000054 - Graphics Hardware Registers
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</a></h2>

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