Drive Duty Switching - Epson S1C17W14 Technical Manual

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.
LDUTY[2:0] bits
0x7
0x6
0x5
0x4
0x3
0x2
0x1
0x0
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
SEG4–53/59 SEG4–53/59 SEG4–53/59 SEG4–53/59 SEG4–53/59 SEG4–53/59 SEG4–53/59 SEG4–53/59 SEG4–53/59
S1C17W14/W16 TECHNICAL MANUAL
(Rev. 1.2)
Table 18.5.4.1 Drive Duty Settings
Duty Valid COM pins
1/8 COM0–COM7
1/7 COM0–COM6
1/6 COM0–COM5
1/5 COM0–COM4
1/4 COM0–COM3
1/3 COM0–COM2
1/2 COM0–COM1
Static 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
Seiko Epson Corporation
Valid SEG pins
S1C17W14 S1C17W16
SEG4–SEG53 SEG4–SEG59
SEG0–SEG53 SEG0–SEG59
Duty
1/5 1/4
COM0 COM0 COM0
COM1 COM1 COM1
COM2 COM2 COM2
COM3 COM3 Unused
COM4 SEG0
Unused SEG1
Unused SEG2
Unused SEG3
18 LCD DRIVER (LCD8B)
Max. number of
display dots/segments
S1C17W14 S1C17W16
400 448
350 392
300 336
250 280
216 240
162 180
108 120
54
1/3 1/2 Static
COM0 COM0
COM1 Unused
Unused Unused
Unused Unused
SEG0 SEG0 SEG0
SEG1 SEG1 SEG1
SEG2 SEG2 SEG2
SEG3 SEG3 SEG3
60
18-7