Output Waveform During Lcd Controller Operation (1/2 Duty) - Fujitsu F2MC-8FX Hardware Manual

24.6.1

Output Waveform during LCD Controller Operation (1/2 Duty)

The display drive output is a multiplex drive type of 2-frame alternating waveform.
In 1/2 duty mode, only COM0 and COM1 are used for display. Neither COM2 nor COM3
is used.
1/2 Bias, 1/2 Duty Output Waveform Example
Those liquid crystal elements are turned "ON" for display which has the maximum potential
difference between the common and segment outputs.
Figure 24.6-2 shows the output waveform when the contents of display RAM are those shown in
Table 24.6-1.
Table 24.6-1 Sample Contents of Display RAM
-: Unused
Segment
SEG n
SEG n+1
Contents of Display RAM
COM3 COM2
- -
- -
CHAPTER 24 LCD CONTROLLER
COM1
0
0
COM0
0
1
455