7. COMMAND
S1D15722D01B000 Technical Manual (Rev.1.1)
EPSON
41
Power-save ON/OFF sequence
Fig.7.6 Power-save ON/OFF sequence
* In power-save state, it is recommended to stop external power supply circuit. For example, in case of
input LCD Bias voltages by external ladder resistances, it is recommended to add cut-off circuit to the
ladder resistances. To recover from power-save state to normal state, quit power-save state after external
power supply circuit ON and stable.
(24) Read status
This command allows detection of bit error of the specific command register, caused by excessive external
noise or the like.
E R/
__
W
A0
___
RD
___
WR D7 D6 D5 D4 D3 D2 D1 D0
Command
0 1 0 1 0 0 0 1 1 1 0
Set
mode
1 0 1
*
*
*
*
*
*
*
P0 Register
read
*: An asterisk (*) denotes invalid bit.
Description of the register value P0 that were read is given below:
Results of
reading
Description
LOW
Error not detected.
HIGH
A bit-flip of part of the command register occurred, which could be a cause of disabled normal
display. Re-execute all the commands.
The commands that support error detection of the register are
•
Display ON/OFF
•
Built-in oscillation circuit ON/OFF
•
Full display lighting ON/OFF
•
Display normal/inverted
•
TEST1 set
The five commands above can be used to detect an error when a bit-flip occurred in any of the specified
registers. When those five commands are executed and operated normally, LOW is output.
When the IC is placed in the reset condition because of external noise or the like, it can also be detected as an
error. So the register P0 will be set to HIGH after resetting by a pin. Therefore, in normal operation
sequence, the above five commands must be set in the register again before executing read status.
Quit power-save state
Power-save ON
Any state
Power-save state
Power-save OFF
Recover state before power-save state
