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Chapter 47 LCD Controller
5.Operation
5.4 1/4 Duty Cycle Output Waveform

In the 1/4 duty cycle output mode, COM0, COM1, COM2, and COM3 outputs are all used for LCD display.

Example of 1/3 Bias Output Waveform

LCD cells with the maximum voltage difference between common and segment output are lit.

Table 5-3 Example of Data Memory Contents for Display

Segment Contents of data memory for display

COM3 output COM2 output COM1 output COM0 output

SEG 2n

output 0100

SEG2n+1

output 0101

COM3 output
COM0 output
COM1 output
COM2 output
V
0
V1
V2
V3
V
0
V1
V2
V
3
V
0
V1
V2
V3
V
0
V1
V2
V
3
SEG 2n output
V
0
V1
V2
V
3
SEG 2n+1 output
V0
V1
V2
V3
LCD cell corresponding to SEG 2n, COM0 output
LCD cell corresponding to SEG 2n, COM1 output
LCD cell corresponding to SEG 2n, COM2 output
LCD cell corresponding to SEG 2n, COM3 output
LCD cell corresponding to SEG 2n+1, COM0 output
LCD cell corresponding to SEG 2n+1, COM1 output
LCD cell corresponding to SEG 2n+1, COM2 output
LCD cell corresponding to SEG 2n+1, COM3 output
O
N
O
FF
O
N
OFF
ON
O
FF
O
N
O
FF
ON
OFF
O
N
O
FF
ON
OFF
O
N
O
FF