LC74731W_11 Datasheet, PDF (14/38 Pages) Sanyo Semicon Device – On-Screen Display Controller

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