HM17CM256 datasheet(71/111 Pages) HYNIX

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HM17CM256

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(34-21) Oscillator circuit Rf control

RE2

RE1

RE0

FFL

Rf2

Rf1

Rf0

( reset

{FFL, Rf2, Rf1, Rf0}=0H, read address : DH)

The feedback resistance of oscillator circuit can be changed by setting this register.

The frame frequency is changed according to the frequency of oscillator, and the oscillation frequency is

determined by the resistor value.

When you set the frame rate, please check the state of LCD display.

Rf 2

Rf 1

Rf 0

Feedback resistance size

Reference value

0.8 x reference value

0.9 x reference value

1.1 x reference value

1.2 x reference value

forbidden

FFL command

Setting oscillator frequency ( frame frequency fFLM). ( refer to DC characteristic )

FFL=0

normal oscillator frequency ( set frame frequency, fFLM to 73Hz(Typ))

FFL=1

high speed oscillator frequency ( set frame frequency, fFLM to 150Hz(Typ))

The value of typical frame frequency fFLMTyp is under following condition.

• Display mode : variable gradation display

• 1/82 Duty

• {Rf

2, Rf1, Rf0}=0H

(34-22) Discharge control

RE2

RE1

RE0

DIS

( reset

{DIS}=0H, read address

EH) * : “Don’t care”

The capacitors connected between VLCD~V4 and VSS can be discharged by this control.

Please refer

to capacitor setting example.

DIS=”0”

discharge stop

DIS=”1”

start discharge

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