UPD78F1502AGK-GAK-AX Datasheet, PDF (698/1031 Pages) Renesas Technology Corp – 16-Bit Single-Chip Microcontrollers

78K0R/Lx3
CHAPTER 16 LCD CONTROLLER/DRIVER
(3) Output waveforms of common and segment signals
The voltages listed in Table 16-4 are output as common and segment signals.
When both common and segment signals are at the select voltage, a display on-voltage of ±VLCD is obtained.
The other combinations of the signals correspond to the display off-voltage.
Table 16-4. LCD Drive Voltage
Common Signal
VLC0/VSS
(a) Static display mode
Segment Signal
Select Signal Level
VSS/VLC0
–VLCD/+VLCD
Deselect Signal Level
VLC0/VSS
0 V/0 V
(b) 1/2 bias method
Common Signal
Select signal level
Deselect signal level
Segment Signal
Select Signal Level
VSS/VLC0
VLC0/VSS
VLC1 = VLC2
–VLCD/+VLCD
1
1
– VLCD/+ VLCD
2
2
(c) 1/3 bias method
Common Signal
Segment Signal
Select Signal Level
VSS/VLC0
Select signal level
Deselect signal level
VLC0/VSS
VLC2/VLC1
–VLCD/+VLCD
1
1
– VLCD/+ VLCD
3
3
(d) 1/4 bias method
Common Signal
Segment Signal
Select Signal Level
VLC0/VSS
Select signal level
Deselect signal level
VSS/VLC0
VLC1/VLC3
+VLCD/–VLCD
1
1
+ VLCD/– VLCD
4
4
Deselect Signal Level
VLC0/VSS
0 V/0 V
1
1
+ VLCD/– VLCD
2
2
Deselect Signal Level
VLC1/VLC2
– ¹ VLCD/+ ¹ VLCD
3
3
1
1
+ VLCD/– VLCD
3
3
Deselect Signal Level
VLC1/VLC2
1
1
+ VLCD/– VLCD
2
2
1
1
– VLCD/+ VLCD
4
4
R01UH0004EJ0501 Rev.5.01
682
Jun 20, 2011