Rainbow Electronics Atmega169L - Manual (Page 223)

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