HM17CM256 datasheet(60/111 Pages) HYNIX

60 / 111 page

HM17CM256

- 60 -

(34-10) Power control register set

RE2

RE1

RE0

AMPON

HALT

DCON

ACL

( reset :{AMPON, HALT, DCON, ACL}=0H

read address :BH )

a) ACL command

This command initializes internal circuit and it is valid only at master operating.

ACL=”0”: normal state

ACL=”1”: initialization ON

Just after the execution of ACL command (ACL=”1”), D0 bit is set to 1.

But as the initialization process

goes on internally, D0 is reset to “0”.

When ACL command is executed, internal reset signal is produced by using local display clock ( clock

from internal oscillator or from external resistor oscillation mode ).

So, after ACL command is executed, it needs to WAIT at least 2 period of the clock for next process

beginning.

ACL command is effective only at master mode operation because it uses original oscillator clock.

It is prohibited for slave mode operation to use the internal oscillator or external oscillator.

So, ACL command is impossible at slave mode.

Please reset the slave device at RES terminal, when

needed.

b) DCON command

ON/OFF the internal voltage boosting circuit.

DCON=”0”:

boosting circuit OFF

DCON=”1”:

boosting circuit ON

c) HALT command

Power save mode ON/OFF control

HALT=”0”:

normal state

HALT=”1”:

power save state

The power consumption is decreased near static current at power save mode.

States of each sub-block in power save mode are as follow.

• Oscillator, built-in power supply block stop.

• Stop driving LCD panel, segment drive, the outputs of common driver are all set to V

SS level.

• Clock input from OSC

1 port is disabled.

• Display RAM data are conserved.

• Operational modes are preserved as those before power save command was executed.

• V

LCD, V1 ~ V4 become high impedance state.

Make display OFF state before power save mode by HALT command.

And when returning from power save mode, you should display ON after oscillator, power circuit is

activated stably.

After display OFF and HALT command, if the display is turned ON before oscillator and power circuit is

not activated stably, wrong display can be appeared.

d) AMPON command

ON/OFF the internal OP. amplifier circuit of power block (voltage regulator block, electric volume,

voltage converting circuit ).

AMPON=”0”:

internal power circuit OP. Amplifier OFF

AMPON=”1”:

internal power circuit OP. Amplifier ON

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