FUJITSU Semiconductor Controller MB89950/950A - Manual (Page 271)

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CHAPTER 12 LCD CONTROLLER/DRIVER
12.4.3 Output Waveforms during LCD Controller/Driver
Operation (1/4 Duty Ratio)
In the 1/4 duty ratio mode, all four common outputs, COM0, COM1, COM2, and COM3
are used.
■ 1/3 bias, 1/4 duty output waveforms
The maximum potential difference exists between a segment output and the corresponding common output
when the segment (LCD cell) is turned on. Figure 12.4-6 "Output waveforms, 1/3 bias and 1/4 duty ratio
example" shows the output waveforms for the display RAM contents listed in Table 12.4-3 "Display RAM
contents example".
Table 12.4-3 Display RAM contents example
Segment
Display RAM contents
COM3 COM2 COM1 COM0
SEGn 0 1 0 0
SEGn+1 0 1 0 1