=== Overview === == Horizontal timing control == ^Address^Size^R/W^Name^Description^ |$E80000|1.w|W|R00|Horizontal total| |$E80002|1.w|W|R01|HSYNC end position| |$E80004|1.w|W|R02|HDISP start position| |$E80006|1.w|W|R03|HDISP end position| == Vertical timing control == ^Address^Size^R/W^Name^Description^ |$E80008|1.w|W|R04|Vertical total| |$E8000A|1.w|W|R05|VSYNC end position| |$E8000C|1.w|W|R06|VDISP start position| |$E8000E|1.w|W|R07|VDISP end position| == Misc 1 == ^Address^Size^R/W^Name^Description^ |$E80010|1.w|W|R08|External sync horiz adjustment : Horiz position fine adjust| |$E80012|1.w|W|R09|Raster number : For raster interrupt| == Text layer scroll == ^Address^Size^R/W^Name^Description^ |$E80014|1.w|W|R10|X scroll| |$E80016|1.w|W|R11|Y scroll| == Graphic layer scroll == ^Address^Size^R/W^Name^Description^ |$E80018|1.w|W|R12|X0| |$E8001A|1.w|W|R13|Y0| |$E8001C|1.w|W|R14|X1| |$E8001E|1.w|W|R15|Y1| |$E80020|1.w|W|R16|X2| |$E80022|1.w|W|R17|Y2| |$E80024|1.w|W|R18|X3| |$E80026|1.w|W|R19|Y3| == Misc 2 == ^Address^Size^R/W^Name^Description^ |$E80028|1.w|R/W|R20|Memory mode/display mode control| |$E8002A|1.w|R/W|R21|TVRAM simultaneous access/raster copy/fast clear plane selection| |$E8002C|1.w|W|R22|For raster copy operation: raster number| |$E8002E|1.w|W|R23|TVRAM access mask pattern| |$E80481|1.b|R/W| |Image capture/fast clear/raster copy control| === Details === CRTC R00($e80000): bit 15 8 7 0 ┌───────────────┬───────────────┐ │ │HTOTAL | └───────────────┴───────────────┘ HSYNC period × horiz width R00 = ────────────────────────── -1 Display period × 8 ※LSB must be 1 CRTC R01($e80002): bit 15 8 7 0 ┌───────────────┬───────────────┐ │ │HSYNC end | └───────────────┴───────────────┘ HSYNC pulse width × horiz width R01 = ───────────────────────────────── -1 Display period × 8 CRTC R02($e80004): bit 15 8 7 0 ┌───────────────┬───────────────┐ │ │HDISP start | └───────────────┴───────────────┘ (HSYNC pulse width ＋ horiz back porch) × horiz width R02 = ───────────────────────────────────────────────────── -5 Display period × 8 CRTC R03($e80006): bit 15 8 7 0 ┌───────────────┬───────────────┐ │ │HDISP end | └───────────────┴───────────────┘ (HSYNC pulse width － horiz front porch) × horiz width R03 = ────────────────────────────────────────────────────── -5 Display period × 8 CRTC R04($e80008): bit 15 8 7 0 ┌───────────────┬───────────────┐ │ │VTOTAL | └───────────────┴───────────────┘ VSYNC period R04 = ──────────── -1 HSYNC period CRTC R05($e8000a): bit 15 8 7 0 ┌───────────────┬───────────────┐ │ │VSYNC end | └───────────────┴───────────────┘ VSYNC pulse width R05 = ───────────────── -1 HSYNC period CRTC R06($e8000c): bit 15 10 9 0 ┌───────────┬───────────────────┐ │ │ VDISP start │ └───────────┴───────────────────┘ VSYNC pulse width ＋ Vertical back porch R06 = ──────────────────────────────────────── -1 HSYNC period CRTC R07($e8000e): bit 15 10 9 0 ┌───────────┬───────────────────┐ │ │ VDISP end │ └───────────┴───────────────────┘ VSYNC pulse width － vertical front porch R07 = ───────────────────────────────────────── -1 HSYNC period CRTC R08($e80010): bit 15 8 7 0 ┌───────────────┬───────────────────────┐ │ │ EXT sync horiz adjust │ └───────────────┴───────────────────────┘ CRTC R09($e80012): bit 15 10 9 0 ┌───────────┬───────────────────┐ │ │ Raster number │ └───────────┴───────────────────┘ VSYNC pulse width + vertical back porch R09 = ────────────────────────────────────────── ＋ raster number HSYNC period = R06 +1 ＋ raster number CRTC R10($e80014): bit 15 10 9 0 ┌───────────┬───────────────────┐ │ │ X Scroll │ └───────────┴───────────────────┘ CRTC R11($e80016): bit 15 10 9 0 ┌───────────┬───────────────────┐ │ │ Y Scroll │ └───────────┴───────────────────┘ CRTC R12($e80018): bit 15 10 9 8 0 ┌───────────┬───────────────────┐ │ │ │ X0 │ └───────────┴───────────────────┘ ※In 512x512 mode bits 0~8 are effective. CRTC R13($e8001a): bit 15 10 9 8 0 ┌───────────┬───────────────────┐ │ │ │ Y0 │ └───────────┴───────────────────┘ ※In 512x512 mode bits 0~8 are effective. CRTC R14($e8001c): bit 15 10 9 8 0 ┌───────────┬───────────────────┐ │ │ │ X1 │ └───────────┴───────────────────┘ ※Unused in 1024x1024 mode. CRTC R15($e8001e): bit 15 10 9 8 0 ┌───────────┬───────────────────┐ │ │ │ Y1 │ └───────────┴───────────────────┘ ※Unused in 1024x1024 mode. CRTC R16($e80020): bit 15 10 9 8 0 ┌───────────┬───────────────────┐ │ │ │ X2 │ └───────────┴───────────────────┘ ※Unused in 1024x1024 mode. CRTC R17($e80022): bit 15 10 9 8 0 ┌───────────┬───────────────────┐ │ │ │ Y2 │ └───────────┴───────────────────┘ ※Unused in 1024x1024 mode. CRTC R18($e80024): bit 15 10 9 8 0 ┌───────────┬───────────────────┐ │ │ │ X3 │ └───────────┴───────────────────┘ ※Unused in 1024x1024 mode. CRTC R19($e80026): bit 15 10 9 8 0 ┌───────────┬───────────────────┐ │ │ │ Y3 │ └───────────┴───────────────────┘ ※Unused in 1024x1024 mode. CRTC R20($e80028): bit 15 13 12 11 10 9 8 7 6 5 4 3 2 1 0 ┌───────┬──┬──┬──┬────────┬─────┬──┬───┬───┐ │ │ │ │ │ COL │ │HF│VD │HD │ └───────┴──┴──┴──┴────────┴─────┴──┴───┴───┘ │　│　 └ SIZE │ G-MEM └ T-MEM bit 12 T-MEM T-VRAM Usage mode %0 : Display %1 : Buffer bit 11 G-MEM G-VRAM Usage mode %0 : Display %1 : Buffer(bit 10～8 are invalid) (G-VRAM in buffer mode has the same structure as 65535 color mode) bit 10 SIZE GVRAM size %0 : 512× 512 pixel %1 : 1024×1024 pixel bit 9～8 COL GVRAM Color mode %00 : 16 colors %01 : 256 colors %10 : Undefined %11 : 65536 colors bit 4 HF Horizontal deflection frequency %0 : 15.98kHz %1 : 31.50kHz bit 3～2 VD Vertical size %00 : 256 pixels %01 : 512 pixels %10 : 1024 pixels - Interlace (Only when HF = %1) %11 : 〃 bit 1～0 HD Horizontal size %00 : 256 pixels %01 : 512 pixels %10 : 768 pixels %11 : 50MHz CRTC clock (Compact XVI and later only without modification) CRTC R21($e8002a): bit 15 10 9 8 7 6 5 4 3 2 1 0 ┌───────────┬─┬─┬───────┬───────┐ │ │ │ │ │ │ │ │ │ │ │ │ └───────────┴─┴─┴───────┴───────┘ │ │AP3～AP0 CP3～CP0 MEN SA bit 9 MEN Text screen access mask %0 : Disabled %1 : Enabled bit 8 SA Text screen simultaneous access %0 : Disabled %1 : Enabled bit 7～4 AP3～AP0 Text screen simultaneous access plane selection %0 : Selected %1 : Unselected bit 3～0 CP3～CP0 ┌ Text layer raster copy target plane └ G-VRAM high speed clear target page %0 : Selected %1 : Unselected CRTC R22($e8002c): bit 15 8 7 0 ┌───────────────┬───────────────┐ │Source raster │Dest raster │ └───────────────┴───────────────┘ (Transfer source) (Transfer dest) CRTC R23($e8002e): bit 15 0 ┌────────────────────────────────────┐ │Text layer simultaneous mask pattern│ └────────────────────────────────────┘ %0 : Data is written %1 : Data is not written CRTC Control port($e80481): bit 7 4 3 2 1 0 ┌───────┬──┬─┬──┬──┐ │ │RC│0│FC│VI│ └───────┴──┴─┴──┴──┘ bit 3 RC Text layer raster copy start %0 : Stop %1 : Start bit 1 FC Graphic layer fast clear start %0 : Stop %1 : Start ※Automatically becomes 0 after operation completes bit 0 VI Image capture start %0 : Stop %1 : Start