MMIO register table/MMIO: Difference between revisions
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m (Minor formatting changes for consistency.) |
Rainwarrior (talk | contribs) (MEMSEL fastrom is backwards?) |
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| Joypad port 2 I/O (2), joypad port 1 I/O (1), unused I/O (D). | | Joypad port 2 I/O (2), joypad port 1 I/O (1), unused I/O (D). | ||
|- | |- | ||
! [[MMIO registers# | ! [[MMIO registers#WRMPYA|WRMPYA]] | ||
! $4202 | ! $4202 | ||
| style="text-align: right" | <tt style="white-space: nowrap">DDDD DDDD</tt> | | style="text-align: right" | <tt style="white-space: nowrap">DDDD DDDD</tt> | ||
| Line 64: | Line 64: | ||
| Unsigned multiplication factor A. | | Unsigned multiplication factor A. | ||
|- | |- | ||
! [[MMIO registers# | ! [[MMIO registers#WRMPYB|WRMPYB]] | ||
! $4203 | ! $4203 | ||
| style="text-align: right" | <tt style="white-space: nowrap">DDDD DDDD</tt> | | style="text-align: right" | <tt style="white-space: nowrap">DDDD DDDD</tt> | ||
| Line 108: | Line 108: | ||
! [[MMIO registers#MEMSEL|MEMSEL]] | ! [[MMIO registers#MEMSEL|MEMSEL]] | ||
! $420D | ! $420D | ||
| style="text-align: right" | <tt style="white-space: nowrap"> | | style="text-align: right" | <tt style="white-space: nowrap">.... ...F</tt> | ||
| W8 | | W8 | ||
| FastROM enable (F). | | FastROM enable (F). | ||
Latest revision as of 09:46, 2 October 2022
See: MMIO register table
| Name | Address | Bits | Type | Notes |
|---|---|---|---|---|
| APUIO0 APUIO1 APUIO2 APUIO3 |
$2140 $2141 $2142 $2143 |
DDDD DDDD | RW8 | Data to/from APU. |
| WMDATA | $2180 | DDDD DDDD | RW8 | Data to/from S-WRAM, increments WMADD. |
| WMADDL WMADDM WMADDH |
$2181 $2182 $2183 |
LLLL LLLL MMMM MMMM .... ...H |
W24 | S-WRAM address for WMDATA access. |
| JOYOUT | $4016 | .... ...D | W8 | Output to joypads (latches standard controllers). |
| JOYSER0 | $4016 | .... ..DD | R8 | Input from joypad 1. |
| JOYSER1 | $4017 | ...1 11DD | R8 | Always 1 (1), input from joypad 2 (D). |
| NMITIMEN | $4200 | N.VH ...J | W8 | Vblank NMI enable (N), timer IRQ mode (VH), joypad auto-read enable (J). |
| WRIO | $4201 | 21DD DDDD | W8 | Joypad port 2 I/O (2), joypad port 1 I/O (1), unused I/O (D). |
| WRMPYA | $4202 | DDDD DDDD | W8 | Unsigned multiplication factor A. |
| WRMPYB | $4203 | DDDD DDDD | W8 | Unsigned multiplication factor B, starts 8-cycle multiplication. |
| WRDIVL WRDIVH |
$4204 $4205 |
LLLL LLLL HHHH HHHH |
W16 | Unsigned dividend. |
| WRDIVB | $4206 | DDDD DDDD | W8 | Unsigned divisor, starts 16-cycle division. |
| HTIMEL HTIMEH |
$4207 $4208 |
.... ...H LLLL LLLL |
W16 | H counter target for timer IRQ. |
| VTIMEL VTIMEH |
$4209 $420A |
.... ...H LLLL LLLL |
W16 | V counter target for timer IRQ. |
| MDMAEN | $420B | 7654 3210 | W8 | DMA enable. |
| HDMAEN | $420C | 7654 3210 | W8 | HDMA enable. |
| MEMSEL | $420D | .... ...F | W8 | FastROM enable (F). |
| RDNMI | $4210 | N... VVVV | R8 | Vblank NMI flag (N), CPU version (V). |
| TIMEUP | $4211 | T... .... | R8 | Timer IRQ flag (T). |
| HVBJOY | $4212 | VH.. ...J | R8 | Vblank flag (V), hblank flag (H), joypad auto-read in-progress flag (J). |
| RDIO | $4213 | 21DD DDDD | R8 | Joypad port 2 I/O (2), joypad port 1 I/O (1), unused I/O (D). |
| RDDIVL RDDIVH |
$4214 $4215 |
LLLL LLLL HHHH HHHH |
R16 | Unsigned quotient. |
| RDMPYL RDMPYH |
$4216 $4217 |
LLLL LLLL HHHH HHHH |
R16 | Unsigned product or unsigned remainder. |
| JOY1L JOY1H JOY2L JOY2H JOY3L JOY3H JOY4L JOY4H |
$4218 $4219 $421A $421B $421C $421D $421E $421F |
LLLL LLLL HHHH HHHH |
R16 | 16-bit joypad auto-read result (first read high to last read low). |
