LC74731 Sanyo Semicon Device, LC74731 Datasheet - Page 14

• Manufacturer Part Number: LC74731
• Description: On-Screen Display Controller
• Manufacturer: Sanyo Semicon Device

COMMAND20 (Vertical display start position setup command)
• First byte
• Second byte
DA0 to 7
DA0 to 7
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
Register
Register
RRM1
RRM0
(MSB)
(LSB)
VP6
VP5
VP4
VP3
VP2
VP1
VP0
—
—
—
—
—
—
—
State
State
1
0
1
0
0
0
0
1
0
1
0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
Command 2 identification code
Vertical display position and vertical direction character size
settings
Extended command 0 identification code
Second byte identification bit
If VS is the vertical display start position then:
VS =
H: the horizontal synchronization pulse period
RRM1
= 20H (525H systems)
= 25H (625H systems)
0
0
1
1
+ H
RRM0
( 2 ∑ 2
0
1
0
1
n=0
6
HS
n
V P n )
Content
Content
Initial value (depends on IR)
1-2-1
1-2-2
1-2-3
LC74731W,74732W
Function
Function
1-2-2
1-2-3
Fixed
HSYNC
Character display area
1-2-3 Fixed
Fixed
VS
Continuous RAM write mode specification
The vertical display start position is set by the 7 bits
VP0 to VP6.
The weight of bit 1 is 2H.
Notes
Notes
No. 6526-14/38