14 lCD DRiVeR
14-14
Seiko epson Corporation
S1C63003/004/008/016 TeChniCal Manual
(Rev. 1.1)
Static Drive
14.3.5
The LCD driver provides software setting of the static drive.
To set in static drive, write "1" to the STCD register. Then, by writing "1" to COM0 to COM7* (display memory)
corresponding to the SEG terminal, the SEG terminal outputs a static on waveform. When all the COM0 to COM7*
bits are set to "0," the SEG terminal outputs an off waveform.
Figure 14.3.5.1 shows the static drive waveform.
Note: The static drive function uses all COM outputs (COM0 to COM7
*
) even if a duty other than 1/8 (1/5
in the S1C63003) is selected. Hence, for static drive, set the same value for all display memory
corresponding to COM0 to COM7
*
.
COM0–7
*
Frame frequency
-V
C3
-V
C2
-V
C1
-V
SS
-V
C3
-V
C2
-V
C1
-V
SS
-V
C3
-V
C2
-V
C1
-V
SS
SEGxx
LCD lighting status
:
:
SEGxx
Not lit
Lit
COM0
COM1
:
COM7
*
3.5.1 Static drive waveform
Figure 14.
*
COM0 to COM4 in the S1C63003
lCD Contrast adjustment
14.3.6
[S1C63004/008/016]
The S1C63004/008/016 allows software to adjust the LCD contrast. This function is realized by controlling the volt-
ages V
C1
, V
C2
and V
C3
output from the LCD system voltage regulator. The contrast can be adjusted to 16 levels using
the LC[3:0] register as shown in Table 14.3.6.1.
3.6.1 LCD contrast
Table 14.
LC[3:0]
Contrast
FH
Level 15
(dark)
EH
Level 14
↑
DH
Level 13
CH
Level 12
BH
Level 11
AH
Level 10
9H
Level 9
8H
Level 8
7H
Level 7
6H
Level 6
5H
Level 5
4H
Level 4
3H
Level 3
2H
Level 2
1H
Level 1
↓
0H
Level 0
(light)
At initial reset, LC[3:0] is set to "0." The software should initialize the register to set to the desired contrast.
When an external power supply is selected by mask option, the LCD contrast cannot be adjusted using LC[3:0].