LH155BA datasheet(35/51 Pages) SHARP

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LH155BA

4.12. Power Control (1) Register Set

(At the time of reset : (BIAS, HALT, PON, ACL) = 0H, read address : BH)

(1) ACL Command

The internal circuit can be initialized. This

command is enabled only at master operation

mode.

ACL = "0" : Normal operation

ACL = "1" : Initialization ON

If the power control register is read out

immediately after executing ACL command

(ACL = 1), the D0 bit is in the state of "1".

Therefore, if the reset operation is internally

started, the D0 bit becomes "0".

In executing ACL command, the internal reset

signals are internally generated by using display

master clock (oscillation by OSCI and OSCO, or

clock input at CK pin).

Therefore, after executing ACL command, allow

a waiting period having at least a two-cycle

portion of the master clock before the next

processing is made.

(2) PON Command

The internal power supply for the graphic

display circuit is set ON/OFF.

PON = "0" : Power supply for the graphic

display circuit OFF

PON = "1" : Power supply for the graphic

display circuit ON

At PON = "1", the booster circuit and voltage

converter for the graphic display circuit function.

In accordance with the setting conditions of

PMODE pin, the operation circuit part changes.

See Table in Section 2.17. for details.

(3)HALT Command

The conditions of power-saving are set ON/OFF

by this command.

HALT = "0" : Normal operation

HALT = "1" : Power-saving operation

When setting in the power-saving state, the

supply current can be reduced to a value near

to that of the standby current.

The internal conditions at power-saving are as

follows.

(a) The oscillation circuit and power supply

circuit are stopped.

(b) The LCD drive is stopped, and outputs of

the segment driver and common driver are

VSS level.

(d) The contents of the display RAM data are

maintained.

(e) The operation mode maintains the command

execution state before executing power-

saving command.

(4) BIAS Command

The internal bias value for the graphic display

can be set by this command.

BIAS = "0" : 1/9 bias

BIAS = "1" : 1/7 bias

(Bias value for the segment display is 1/3 fixed.)

BIAS

HALT

PON

ACL

CSB

RDB

WRB

1010

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