Difference between revisions of "ULA Control Register"
From SpecNext official Wiki
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|Readable=Yes | |Readable=Yes | ||
|Writable=Yes | |Writable=Yes | ||
| − | |ShortDesc= | + | |ShortDesc=Disable ULA, controls ULA mixing/blending, enable ULA+ |
}} | }} | ||
{| class="wikitable" | {| class="wikitable" | ||
! Bit !! Function | ! Bit !! Function | ||
|- | |- | ||
| − | | 7 || 1 to disable ULA output | + | | 7 || 1 to disable ULA output (soft reset = 0) |
|- | |- | ||
| − | | 6 || 0 to select the ULA colour for blending in SLU modes 6 & 7 | + | | 6 || 0 to select the ULA colour for blending in SLU modes 6 & 7 (soft reset = 0) |
1 to select the ULA/tilemap mix for blending in SLU modes 6 & 7 | 1 to select the ULA/tilemap mix for blending in SLU modes 6 & 7 | ||
|- | |- | ||
| − | | 5-1 || Reserved, must be 0 | + | | 5-4 || Reserved, must be 0 |
| + | |- | ||
| + | | 3 || ULA+ enable (soft reset = 0) | ||
| + | |- | ||
| + | | 2 || may change (ULA half pixel scroll) (soft reset = 0) | ||
| + | |- | ||
| + | | 1 || Reserved, must be 0 | ||
|- | |- | ||
| 0 || 1 to enable stencil mode when both the ULA and tilemap are enabled | | 0 || 1 to enable stencil mode when both the ULA and tilemap are enabled | ||
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|} | |} | ||
| − | Bit 0 can be set to choose stencil mode for the combined output of the ULA and [[Tilemap | + | Bit 0 can be set to choose stencil mode for the combined output of the ULA and [[Tilemap]]. |
Bit 6 determines what colour is used in SLU modes 6 & 7 where the ULA is combined with Layer 2 to generate highlighting effects. | Bit 6 determines what colour is used in SLU modes 6 & 7 where the ULA is combined with Layer 2 to generate highlighting effects. | ||
| − | |||
| − | |||
Revision as of 07:56, 12 November 2019
| Number | $68 |
|---|---|
| Readable | Yes |
| Writable | Yes |
| Short Description | Disable ULA, controls ULA mixing/blending, enable ULA+ |
| Bit | Function |
|---|---|
| 7 | 1 to disable ULA output (soft reset = 0) |
| 6 | 0 to select the ULA colour for blending in SLU modes 6 & 7 (soft reset = 0)
1 to select the ULA/tilemap mix for blending in SLU modes 6 & 7 |
| 5-4 | Reserved, must be 0 |
| 3 | ULA+ enable (soft reset = 0) |
| 2 | may change (ULA half pixel scroll) (soft reset = 0) |
| 1 | Reserved, must be 0 |
| 0 | 1 to enable stencil mode when both the ULA and tilemap are enabled
(if either are transparent the result is transparent otherwise the result is a logical AND of both colours) |
Bit 0 can be set to choose stencil mode for the combined output of the ULA and Tilemap.
Bit 6 determines what colour is used in SLU modes 6 & 7 where the ULA is combined with Layer 2 to generate highlighting effects.