7. COMMAND
40
EPSON
S1D15722D01B000 Technical Manual (Rev.1.1)
V
3
V
2
V
1
V
C
MV
1
MV
2
In discharge state : short
V
SSH
V
SSL
Fig.7.5 Location of Switching Elements for Discharge
(23) Power-saving
This commands places the IC in the power-saving mode. When all operations of the LCD system are
stopped and there is no access from the MPU, current consumption can be reduced to the value close to static
current.
E
R/
__
W
A0
___
RD
___
WR
D7 D6 D5
D4
D3
D2
D1
D0
Power-saving
mode
0 1 0 1 0 1 0 1 0 0 0
OFF
1
ON
*: After resetting by the
____
RES pin, it is set to power-saving OFF.
In the power-saving condition, display data and operating state before starting power save command is held
and display data RAM is accessible from MPU.
The power save OFF command is used to cancel the power-saving condition and reset to the state prior to
starting power save command.
In the power-saving mode,
•
The built-in oscillation circuit is stopped.
•
All the liquid crystal drive circuits are stopped (V
C
level is output from all SEG/COM.)
•
The temperature sensor circuit and V
DI
generation circuit operate.
It is recommended to stop the function of the external power supply circuit when starting the power save
function. For example, if each level of the liquid crystal drive voltage is provided in the external resistive
division circuit, it is recommended to add a circuits that cuts current flowing into the resistive division circuit
when starting the power save function. It is recommended to quit the power saving-state, goes power-saving
OFF after turing the external power circuit ON and stabilized it.
