FUJITSU Semiconductor Controller MB89950/950A - Manual (Page 268)

254
CHAPTER 12 LCD CONTROLLER/DRIVER
12.4.2 Output Waveforms during LCD Controller/Driver
Operation (1/3 Duty Ratio)
In the 1/3 duty ratio mode, the COM0, COM1 and COM2 outputs are used by the display.
COM3 is not used.
■ 1/3 bias, 1/3 duty output waveform
The maximum potential difference exists between a segment output and the corresponding common output
when the segment (LCD cell) is turned on. Figure 12.4-4 "Output waveforms, 1/3 bias and 1/3 duty ratio
example" shows the output waveforms for the display RAM contents listed in Table 12.4-2 "Display RAM
contents example".
Table 12.4-2 Display RAM contents example
Segment
Display RAM contents
COM3 COM2 COM1 COM0
SEGn
−
1 0 0
SEGn+1
−
1 0 1
−: Not used