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14 lCD DRiVeR
14.3.5
Static Drive
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*
SEGxx
* COM0 to COM4 in the S1C63003
14.3.6
lCD Contrast adjustment
The S1C63004/008/016 allows software to adjust the LCD contrast. This function is realized by controlling the volt-
ages V
, V
and V
output from the LCD system voltage regulator. The contrast can be adjusted to 16 levels using
C1
C2
C3
the LC[3:0] register as shown in Table 14.3.6.1.
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].
14-14
Frame frequency
Figure 14.
3.5.1 Static drive waveform
[S1C63004/008/016]
Table 14.
3.6.1 LCD contrast
LC[3:0]
FH
EH
DH
CH
BH
AH
9H
8H
7H
6H
5H
4H
3H
2H
1H
0H
Seiko epson Corporation
LCD lighting status
-V
COM0
C3
-V
COM1
C2
-V
:
C1
-V
*
COM7
SS
SEGxx
Not lit
-V
C3
-V
C2
-V
:
C1
-V
SS
-V
C3
-V
C2
-V
:
C1
-V
SS
Contrast
Level 15
(dark)
↑
Level 14
Level 13
Level 12
Level 11
Level 10
Level 9
Level 8
Level 7
Level 6
Level 5
Level 4
Level 3
Level 2
↓
Level 1
Level 0
(light)
S1C63003/004/008/016 TeChniCal Manual
Lit
(Rev. 1.1)
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