Datasheet

RL78/L12 CHAPTER 14 LCD CONTROLLER/DRIVER
R01UH0330EJ0200 Rev.2.00 638
Dec 13, 2013
(3) Output waveforms of common and segment signals
The voltages listed in Table 14-14 are output as common and segment signals.
When both common and segment signals are at the select voltage, a display on-voltage of ±V
LCD is obtained. The
other combinations of the signals correspond to the display off-voltage.
Table 14-14. LCD Drive Voltage
(a) Static display mode
Segment Signal
Common Signal
Select Signal Level Deselect Signal Level
VSS/VL4 VL4/VSS
VL4/VSS –VLCD/+VLCD 0 V/0 V
(b) 1/2 bias method
Segment Signal
Common Signal
Select Signal Level Deselect Signal Level
VSS/VL4 VL4/VSS
Select signal level VL4/VSS –VLCD/+VLCD 0 V/0 V
Deselect signal level VL2 – VLCD/+ VLCD + VLCD/– VLCD
(c) 1/3 bias method (waveform A or B)
Segment Signal
Common Signal
Select Signal Level Deselect Signal Level
VSS/VL4 VL2/VL1
Select signal level VL4/VSS –VLCD/+VLCD – VLCD/+ VLCD
Deselect signal level VL1/VL2 – VLCD/+ VLCD + VLCD/– VLCD
(d) 1/4 bias method (waveform A or B)
Segment Signal
Common Signal
Select Signal Level Deselect Signal Level
VSS/VL4 VL2
Select signal level VL4/VSS –VLCD/+VLCD – VLCD/+ VLCD
Deselect signal level VL1/VL3 – VLCD/+ VLCD + VLCD/– VLCD
1
2
1
2
1
2
1
2
1
3
1
3
1
3
1
3
1
4
1
4
1
4
1
4
1
3
1
2
1
2
1
3