
S1C8F360 TECHNICAL MANUAL
EPSON
117
5 PERIPHERAL CIRCUITS AND THEIR OPERATION (LCD Controller)
LCDAJ: 00FF09HD1
Switches the internal power supply.
When "1" is written: TYPE A
When "0" is written: TYPE B
Reading:
Valid
LCDAJ is the LCD power switching register. When
"1" is written, the LCD power supply is set for
TYPE A (4.5 V) and when "0" is written the LCD
power supply is set for TYPE B (5.5 V).
At initial reset, LCDAJ is set to "0" (TYPE B).
DUTY8: 00FF09HD0
Switches the drive duty.
When "1" is written: 1/8 duty
When "0" is written: 1/16 or 1/32 duty
Reading:
Valid
DUTY8 is the drive duty switching register. When
"1" is written, 1/8 duty is selected and when "0" is
written, 1/16 or 1/32 duty is selected.
When "1" is written to DUTY8, switching between
1/16 duty and 1/32 duty using LDUTY becomes
invalid.
At initial reset, DUTY8 is set to "0" (1/16 or 1/32
duty).
LDUTY: 00FF10HD1
Selects the drive duty.
When "1" is written: 1/16 duty
When "0" is written: 1/32 duty
Reading:
Valid
When "0" is written to LDUTY, 1/32 duty is
selected and the combined common/segment
output terminal is switched to the common termi-
nal.
When "1" is written to LDUTY, 1/16 duty is selected
and the combined common/segment output
terminal is switched to the segment terminal.
When "1" is written to DUTY8, the combined
common/segment terminals are fixed to the
segment terminals and the setting of LDUTY
becomes invalid.
The correspondence between the display memory
bits set according to the drive duty, and the com-
mon/segment terminals are shown in Figures
5.12.6.1–5.12.6.6.
At initial reset, LDUTY is set to "0" (1/32 duty).
DTFNT: 00FF10HD2
Selects the dot font.
When "1" is written: 5
× 5 dots
When "0" is written: 5
× 8 dots
Reading:
Valid
Select 5
× 8 dots or 5 × 5 dots type for the display
memory area.
When "0" is written to DTFNT, 5
× 8 dots is selected
and when "1" is written, 5
× 5 dots is selected.
The correspondence between the display memory
bits set according to the dot font, and the common/
segment terminals are shown in Figures 5.12.6.1–
5.12.6.6.
At initial reset, DTFNT is set to "0" (5
× 8 dots).
DSPAR: 00FF11HD6
Selects the display area.
When "1" is written: Display area 1
When "0" is written: Display area 0
Reading:
Valid
Selects which display area is secured for two
screens in the display memory, will be displayed
when 1/16 or 1/8 duty is selected.
When "0" is written to DSPAR, display area 0 is
selected and when "1" is written, display area 1 is
selected.
When 1/32 duty is selected, since the display area
is only for one screen, the setting of DSPAR
becomes invalid.
The correspondence between the display memory
bits set according to the display area, and the
common/segment terminals are shown in Figures
5.12.6.1–5.12.6.6.
At initial reset, DSPAR is set to "0" (display area 0).
LCDC0, LCDC1: 00FF11HD4, D5
Controls the LCD display.
Table 5.12.9.2 LCD display control
LCDC1
LCDC0
LCD display
1
0
1
0
1
0
All LCDs lit (Static)
All LCDs out (Dynamic)
Normal display
Drive OFF
The four settings mentioned above can be made
without changing the display memory data.
At initial reset and in the SLEEP status, this register
is set to "0" (drive off).