Inverted Display; Drive Duty Switching; Drive Waveforms - Epson S1C17W18 Technical Manual

18.5.3 Inverted Display

The LCD panel display can be inverted (black/white inversion) using merely control bit manipulation, without re-
writing the display data RAM. Setting the LCD8DSP.DSPREV bit to 0 inverts the display; setting it to 1 returns the
display to normal status. Note that the display will not be inverted when the LCD8DSP.DSPC[1:0] bits = 0x3 (All
off).

18.5.4 Drive Duty Switching

Drive duty can be set to 1/8 to 1/2 or static drive using the LCD8TIM1.LDUTY[2:0] bits. Table 18.5.4.1 shows the
correspondence between the LCD8TIM1.LDUTY[2:0] bit settings, drive duty, and maximum number of display
segments.
LCD8TIM1.
Duty Valid COM pins
LDUTY[2:0] bits
0x7 1/8
0x6 1/7
0x5 1/6
0x4 1/5
0x3 1/4
0x2 1/3
0x1 1/2
0x0 Static
Unused common pins output an OFF waveform that turns the segments off.
The some pins are shared with a SEG output and a COM output, and they are configured to the SEG or COM pin
according to the drive duty selected.
Pin
1/8
COM0 COM0
COM1 COM1
COM2 COM2
COM3 COM3
COM4/SEG0 COM4
COM5/SEG1 COM5
COM6/SEG2 COM6
COM7/SEG3 COM7
SEG4–47 SEG4–47

18.5.5 Drive Waveforms

Figures 18.5.5.1 to 18.5.5.4 show some drive waveform examples.
S1C17W18 TECHNICAL MANUAL
(Rev. 1.2)
Table 18.5.4.1 Drive Duty Settings
Valid SEG pins
64pin
COM0–7
COM0–6
SEG4–23
SEG35–38
COM0–5
COM0–4
COM0–3
COM0–2
SEG0–23
COM0–1 SEG35–38
COM0
Table 18.5.4.2 SEG/COM Pin Configuration
1/7 1/6
COM0 COM0
COM1 COM1
COM2 COM2
COM3 COM3
COM4 COM4
COM5 COM5
COM6 Unused
Unused Unused
SEG4–47 SEG4–47
Seiko Epson Corporation
80pin 128pin/Chip
SEG4–27
SEG4–47
SEG0–27
SEG0–47
Duty
1/5 1/4
COM0 COM0
COM1 COM1
COM2 COM2
COM3 COM3
COM4 SEG0
Unused SEG1
Unused SEG2
Unused SEG3
SEG4–47 SEG4–47 SEG4–47
18 LCD DRIVER (LCD8B)
Max. number of
display dots/segments
64pin 80pin 128pin/Chip
160 224
140 196
120 168
100 140
96 128
72 96
48 64
24 32
1/3 1/2 Static
COM0 COM0 COM0
COM1 COM1 Unused
COM2 Unused Unused
Unused Unused Unused
SEG0 SEG0
SEG1 SEG1
SEG2 SEG2
SEG3 SEG3
SEG4–47 SEG4–47
352
308
264
220
192
144
96
48
SEG0
SEG1
SEG2
SEG3
18-7