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14.3
lCD Display Control
14.3.1
Selecting Display Mode
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.
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)
14.3.2
Switching Drive Duty
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).
LDUTY[2:0]
Drive duty
7
1/8
6
1/7
5
1/8
4
1/7
3
1/6
2
1/5
1
1/4
0
1/3
14.3.3
Switching Frame Frequency
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.
FLCKS[1:0]
Source clock
3
2
16.0 Hz
1
21.3 Hz
0
32.0 Hz
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.
S1C63003/004/008/016 TeChniCal Manual
(Rev. 1.1)
Table 14.
3.1.1 Display mode
DSPC[1:0]
3
2
1
0
Table 14.
3.2.1 Drive duty settings
Common terminals
S1C63016
used
448 (56 × 8)
COM0–COM7
392 (56 × 7)
COM0–COM6
448 (56 × 8)
COM0–COM7
392 (56 × 7)
COM0–COM6
336 (56 × 6)
COM0–COM5
280 (56 × 5)
COM0–COM4
224 (56 × 4)
COM0–COM3
168 (56 × 3)
COM0–COM2
Table 14.
3.3.1 Frame frequency settings
1/8 duty
1/7 duty
16.0 Hz
18.3 Hz
21.3 Hz
24.4 Hz
32.0 Hz
36.6 Hz
Seiko epson Corporation
Display mode
All on mode
All off mode
All on mode
Normal mode
Maximum number of segments
S1C63008
400 (50 × 8)
288 (36 × 8)
350 (50 × 7)
252 (36 × 7)
400 (50 × 8)
288 (36 × 8)
350 (50 × 7)
252 (36 × 7)
300 (50 × 6)
216 (36 × 6)
250 (50 × 5)
180 (36 × 5)
200 (50 × 4)
144 (36 × 4)
150 (50 × 3)
108 (36 × 3)
1/6 duty
1/5 duty
Prohibited
21.3 Hz
12.8 Hz
28.5 Hz
17.1 Hz
42.7 Hz
25.6 Hz
14 lCD DRiVeR
S1C63004
S1C63003
–
–
–
–
–
110 (22 × 5)
88 (22 × 4)
66 (22 × 3)
1/4 duty
1/3 duty
16.0 Hz
21.3 Hz
21.3 Hz
28.5 Hz
32.0 Hz
42.7 Hz
(When f
= 32.768 kHz)
OSC1
14-7
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