LC7872E Datasheet, PDF (14/17 Pages) Sanyo Semicon Device – CD Graphics Decoder

Microcontroller Interface (CCB Bus)
1. 2N byte input command
LC7872E
Address (F4h): lsb [ 0 0 1 0 1 1 1 1 ] msb
Control item: lsb [ 0 - - - A A A A ] msb; Where AAAA is the register number.
Register 0 (mode setting)
Data: lsb [ A B C D E F G H ] msb; Default: [ 0 0 0 0 0 1 1 0 ]
A = VRAM/BG 0: Display the contents of VRAM
1: Display the background color (BGC)
B = TV/LINE 0: TV graphics mode
1: Line graphics mode
C = Disk command enable
0: Only disk commands are accepted.
1: Disk commands are ignored and only MGC is accepted.
D = Color bar on/off
0: Off
1: Color bar on
EFG = Comparison conditions in superimposition mode (only valid when SON = 1)
EF = 00: Comparison not performed.
01: When the border color is not black, YS is set high (display) for section whose color does
not match the border color and is set low (clear) otherwise.
11: YS is set high for sections that do not match the chroma key color, and is set low
otherwise.
G = 0: The whole screen is set low (clear) when the comparison condition does not hold for EF
= 00 and EF = 01.
G = 1: The whole screen is set high (display) when the comparison condition does not hold for
EF = 00 and EF = 01.
H = INIT
0: Normal
1: Internal reset
On an internal reset the display screen is set to a blue background screen.
Register 1 (screen position adjustment)
Data: lsb [ H H H H V V V V ] msb; Default: [ 0 0 0 0 0 0 0 0 ]
H = horizontal direction. The value is specified as a two’s complement value with left being the positive
direction. Position is adjustable in two dot units from –16 to +14 dots from the center.
V = vertical direction. The value is specified as a two’s complement value with up being the positive
direction. Position is adjustable in two dot units from –16 to +14 dots from the center.
Register 2 (on/off settings for channels 0 to 7)
Data: lsb [ C C C C C C C C ] msb; Default: [ 1 1 0 0 0 0 0 0 ]
C = channel 0 to 7
0: off
1: on
No. 4868-14/17