MMIO register table/MMIO: Difference between revisions
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Rainwarrior (talk | contribs) (bread) |
Rainwarrior (talk | contribs) (420B/420C are in this range (though we can have additional extra-table entries at DMA registers too)) |
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| Line 93: | Line 93: | ||
| W16 | | W16 | ||
| V counter target for timer IRQ. | | V counter target for timer IRQ. | ||
|- | |||
! [[DMA registers#MDMAEN|MDMAEN]] | |||
! $420B | |||
| style="text-align: right" | <tt style="white-space: nowrap">7654 3210</tt> | |||
| W8 | |||
| DMA enable. | |||
|- | |||
! [[DMA registers#HDMAEN|HDMAEN]] | |||
! $420C | |||
| style="text-align: right" | <tt style="white-space: nowrap">7654 3210</tt> | |||
| W8 | |||
| HDMA enable. | |||
|- | |- | ||
! [[MMIO registers#MEMSEL|MEMSEL]] | ! [[MMIO registers#MEMSEL|MEMSEL]] | ||
Revision as of 23:06, 23 May 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). |
