Internal Port Decoding b8-15 Register
From SpecNext Wiki
| Next Register Number | $83 |
|---|---|
| Readable | Yes |
| Writable | Yes |
| Short Description | Enabling internal ports decoding |
| Bit | Description |
|---|---|
| 7 | (bit 15) Enabling IO:$123B |
| 6 | (bit 14) Enabling IO:$xx57, IO:$xx5B and IO:$303B |
| 5 | (bit 13) Enabling IO:$FADF, IO:$FBDF and IO:$FFDF |
| 4 | (bit 12) Enabling IO:$133B, IO:$143B and IO:$153B (UART) |
| 3 | (bit 11) Enabling IO:$xxE7 and IO:$xxEB (SPI) |
| 2 | (bit 10) Enabling IO:$103B and IO:$113B |
| 1 | (bit 9) Enabling Multiface (two variable ports) |
| 0 | (bit 8) Enabling IO:$xxE3 (DivMMC control) |
All bits are set to 1 upon soft reset.
(note: Next registers with number higher than $7F are inaccessible from Copper code)