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14 lCD DRiVeR
S1C63003/004/008/016 TeChniCal Manual
Seiko epson Corporation
14-7
(Rev. 1.1)
lCD Display Control
14.3
Selecting Display Mode
14.3.1
In addition to the LPWR register for turning the display on and off, the DSPC[1:0] register is provided to select a
display mode. There are three display modes available as shown in Table 14.3.1.1.
3.1.1 Display mode
Table 14.
DSPC[1:0]
Display mode
3
All on mode
2
All off mode
1
All on mode
0
Normal mode
Normal mode: The display memory contents are output without being processed.
All on mode: All the LCD segments go on. The SEG terminals output an on waveform. The contents in the display
memory are not modified.
All off mode: All the LCD segments go off. The SEG terminals output an off waveform. The contents in the display
memory are not modified. (default)
Switching Drive Duty
14.3.2
In the S1C63004/008/016, the drive duty can be selected from six types (1/3 to 1/8) using the LDUTY[2:0] register.
In the S1C63003, the drive duty can be selected from three types (1/3 to 1/5).
3.2.1 Drive duty settings
Table 14.
LDUTY[2:0]
Drive duty
Common terminals
used
Maximum number of segments
S1C63016
S1C63008
S1C63004
S1C63003
7
1/8
COM0–COM7
448 (56
×
8)
400 (50
×
8)
288 (36
×
8)
–
6
1/7
COM0–COM6
392 (56
×
7)
350 (50
×
7)
252 (36
×
7)
–
5
1/8
COM0–COM7
448 (56
×
8)
400 (50
×
8)
288 (36
×
8)
–
4
1/7
COM0–COM6
392 (56
×
7)
350 (50
×
7)
252 (36
×
7)
–
3
1/6
COM0–COM5
336 (56
×
6)
300 (50
×
6)
216 (36
×
6)
–
2
1/5
COM0–COM4
280 (56
×
5)
250 (50
×
5)
180 (36
×
5)
110 (22
×
5)
1
1/4
COM0–COM3
224 (56
×
4)
200 (50
×
4)
144 (36
×
4)
88 (22
×
4)
0
1/3
COM0–COM2
168 (56
×
3)
150 (50
×
3)
108 (36
×
3)
66 (22
×
3)
Switching Frame Frequency
14.3.3
The frame frequency is determined by the selected drive duty and the clock supplied from the clock manager. The
clock to be supplied (16 Hz, 21.3 Hz, or 32 Hz) can be selected using the FLCKS[1:0] register. Selecting a low frame
frequency can reduce current consumption.
3.3.1 Frame frequency settings
Table 14.
FLCKS[1:0]
Source clock
1/8 duty
1/7 duty
1/6 duty
1/5 duty
1/4 duty
1/3 duty
3
Prohibited
2
16.0 Hz
16.0 Hz
18.3 Hz
21.3 Hz
12.8 Hz
16.0 Hz
21.3 Hz
1
21.3 Hz
21.3 Hz
24.4 Hz
28.5 Hz
17.1 Hz
21.3 Hz
28.5 Hz
0
32.0 Hz
32.0 Hz
36.6 Hz
42.7 Hz
25.6 Hz
32.0 Hz
42.7 Hz
(When f
OSC1
= 32.768 kHz)
Notes: • Make sure the LCD display is off (LPWR = "0") before setting the frame frequency. If the frame
frequency is switched when the LCD display is on (LPWR = "1"), the LCD may not display nor-
mally for one frame period after switching.
• The frame frequency affects the display quality. We recommend that the frame frequency should
be determined after the display quality is evaluated using the actual LCD panel.