lc7872e Sanyo Semiconductor Corporation, lc7872e Datasheet - Page 14

• Manufacturer Part Number: lc7872e
• Description: Cd Graphics Decoder
• Manufacturer: Sanyo Semiconductor Corporation

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