Lcd contrast control register – lcdccr, Atmega169v/l – Rainbow Electronics Atmega169L User Manual
Page 223
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223
ATmega169V/L
2514A–AVR–08/02
LCD Contrast Control
Register – LCDCCR
• Bits 7:4 – Res: Reserved Bits
These bits are reserved bits in the ATmega169 and will always read as zero.
• Bits 3:0 – LCDCC3:0: LCD Contrast Control
The LCDCC3:0 bits determine the maximum voltage VLCD on segment and common
pins. The different selections are shown in Table 99. New values take effect every
beginning of a new frame.
Bit
7
6
5
4
3
2
1
0
–
–
–
–
LCDCC3
LCDCC2
LCDCC1
LCDCC0
LCDCCR
Read/Write
R
R
R
R
R/W
R/W
R/W
R/W
Initial Value
0
0
0
0
0
0
0
0
Table 99. LCD Contrast Control
LCDCC3
LCDCC2
LCDCC1
LCDCC0
Maximum Voltage V
LDC
0
0
0
0
2.60
0
0
0
1
2.65
0
0
1
0
2.70
0
0
1
1
2.75
0
1
0
0
2.80
0
1
0
1
2.85
0
1
1
0
2.90
0
1
1
1
2.95
1
0
0
0
3.00
1
0
0
1
3.05
1
0
1
0
3.10
1
0
1
1
3.15
1
1
0
0
3.20
1
1
0
1
3.25
1
1
1
0
3.30
1
1
1
1
3.35
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