hd66420 Renesas Electronics Corporation., hd66420 Datasheet - Page 46

• Manufacturer Part Number: hd66420
• Description: Ram-provided 160 Channel 4-level Grey Scale Driver For Dot Matrix Graphics Lcd
• Manufacturer: Renesas Electronics Corporation.

HD66420
Contrast Control and LCD Alternative Drive Cycle Register (R16): The contrast control register
(figure 37) designates the contrast level of LCD display. These bits change the voltage which is supplied to
LCD drivers.
The LCD alternative drive cycle register designates the number of lines that LCD drive outputs are
alternated.
Data bits 7 is unused; they should be set to 0 when written to.
46
R8
R9
R10
Set value
R12
R13
R14
R15
Data bit
Set value
H’00
H’01
H’02
H’03
H’04
Set value
Set value
Set value
Set value
Set value
Set value
Set value
Data bit
Data bit
Row no.
COM1 to COM8
COM9 to COM16
COM17 to COM24
COM25 to COM32
COM33 to COM40
7
Figure 35 Partial Display Start Raster Register (R11)
Figure 36 Grayscale Palette Registers (R12 to R15)
Figure 34 Blink Registers (R8, R9, R10)
BK0
BK8
6
7
7
5
BK1
BK9
6
6
Set value
H’05
H’06
H’07
H’08
H’09
BK10 BK11 BK12 BK13 BK14
BK2
4
5
5
Row no.
COM80 to COM73
COM72 to COM65
COM64 to COM57
COM56 to COM49
COM48 to COM41
PB3
GP14 GP13 GP12 GP11
GP24 GP23 GP22 GP21
GP34 GP33 GP32 GP31
GP44 GP43 GP42 GP41
BK3
3
4
4
PB2
BK16 BK17 BK18
2
BK4
3
3
PB1
BK5
1
2
2
PB0
(ADC= “0”. If “1” ,
reverse direction)
BK6
0
1
1
BK15
BK19
GP10
GP20
GP30
GP40
BK7
0
0