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mediate level (unselected), causing display to turn off. Therefore, for the LCD unit to be pow-
ered down, the liquid crystal drive power supply (with relatively large steady-state current)
must be turned off at the same time display is turned off by using the YDIS signal.
2. If the drive power supply of the liquid crystal remains on in sleep mode, a DC component
may be applied to the LCD panel because all internal operations of the S1D13700 have
been stopped in that mode. When priority is placed on reliability, however, the liquid crystal
drive power supply must be turned off before writing the sleep command to prevent DC com-
ponents from being applied to the LCD panel.
3. Although the bus is placed in the high-impedance state during sleep mode, some voltage
may be supplied to the bus line for a bus with pull-up/pull-down resistors.
3.3.2
Display Control Commands
DISP ON/OFF
This command turns display of the entire screen on or off.
The parameters that follow this command turn the cursor and each layered screen on or off individually, and
select the cursor blink rate and screen flashing rate. Setting a blink rate and flashing rate makes area flashing
possible (i.e., flashing one entire line) instead of flashing just one character by means of cursor display.
<Indirect mode>
MSB
D7
D6
C
0
1
FP5
FP4
P1
C
D
Note: Parameter D (to disable entire screen display) has priority over parameter FP.
Note: When the entire screen display is disabled (D=0), power to the panel is off (YDIS
[Parameter P1]
FC
Selects turning the cursor on or off and defines a blink rate.
Note: As the MWRITE command always enables the cursor, the cursor position can be
S1D13700 Technical Manual
D5
D4
D3
D2
0
1
1
0
FP3
FP2
FP1
FP0
0: Disables entire screen display.
1: Restores entire screen display.
= 0 level) and the panel timing signal is off.
FC1, FC0
OFF (blank)
0
0
0
1
Blinking off
1
0
ON
Blink at fFR/32 Hz (approx. 2 Hz)
1
1
Blink at fFR/64 Hz (approx. 1 Hz)
Cusor blink on/off ratio
ON : OFF = 7 : 3
checked, even when performing consecutive writes to display memory while the
cursor is flashing.
3: COMMANDS AND COMMAND REGISTERS
<Direct mode>
LSB
D1
D0
0
0
FC1
FC0
Cursor display
EPSON
Address
Register name
0x8009
r_DispOnOff
bit0 : DispOn
0x800A
r_P1_DispOnOff
bit7-2 : FP5-FP0
bit1-0 : FC1-FC0
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