lc7874e Sanyo Semiconductor Corporation, lc7874e Datasheet - Page 18

• Manufacturer Part Number: lc7874e
• Description: Cd Graphics Decorder
• Manufacturer: Sanyo Semiconductor Corporation

Description of Commands
Command transmission should be performed LSB-first.
1. Control item code 00HEX: Various mode settings
2. Control item code 10
Default: MSB [01100000] LSB
Data 0: VRAM/BG Display screen switchover setting
Data 1: TV/LINE Graphic display mode setting
Data 2: DISK/GPH Disk command acceptance control
Data 3: CB Color bar screen output setting
Data 4: SCP0 YS output (pin 52) control
Data 5: SCP1 Superimposition compare condition (valid only when SON = 1: pin 60)
Data 6: SCP2 YS output (pin 52) control
Data 7: INIT Software reset setting
Default: MSB [00000000] LSB
Data 0: HP0 Horizontal fine adjustment of screen position
Data 1: HP1 Specified as two’s complement with left as positive direction
Data 2: HP2 (variable by –16 to +14 dots from center in 2-dot units)
Data 3: HP3
Data 4: VP0 Vertical fine adjustment of screen position
Data 5: VP1 Specified as two’s complement with up as positive direction
Data 6: VP2 (variable by –16 to +14 dots from center in 2-dot units)
Data 7: VP3
0: VRAM contents displayed
1: Background color displayed
0: TV graphic mode
1: LINE graphic mode
0: DISK command only accepted
1: DISK command acceptance ignored, MGC (Micro graphic command) only accepted
0: Graphic signal output
1: Color bar signal output
0: When SCP0, SCP1 = 0, 0; 0, 1, and compare condition is not satisfied, setting is full-screen low
1: L: When SCP0, SCP1 = 0, 0; 0, 1, and compare condition is not satisfied, setting is full-screen high
0: Internal reset not executed (normal)
1: Internal reset executed (display screen becomes blue background screen)
SCP1
(transparent)
(display)
0
1
1
SCP0
0
0
1
HEX
Comparison not performed
When border color is black, YS is high (display) in the parts whose color does
not match the border color, and low (transparent) otherwise
High in parts whose color does not match the chroma key color; low otherwise
: Fine adjustment of screen position
Compare condition
LC7874E
No. 5521-18/22