HM17CM256 datasheet(37/111 Pages) HYNIX

37 / 111 page

HM17CM256

- 37 -

ACCESS WITH 8 BIT BUS EXAMPLE : GRAY MODE , ACCESS UNDER (REF, SWAP)=(0, 0)

(21) OSCILLATOR CIRCUIT

HM17CM256 has the CR oscillator. The output of oscillator is used as the timing signal source of

display and boosting clock to the booster. This is valid only in the master operation mode.

When in the master operation mode and if external clock is used, feed the clock to OSC1 pin or

connect resistor between OSC1 and OSC2.

And feedback resistance with command can set the inner oscillator circuit of HM17CM256.

The frame frequency can be altered by changed oscillator frequency according to feedback

resistance length set value. To get optimum frame frequency, please check LCD and then set the

frequency of oscillator.

(22) POWER SUPPLY CIRCUIT

Gradation

palette

GLSB circuit

Gradation control circuit

Latched data

SEGSA0

SEGSB0

Palette Aj

Palette Bj

SEGSC0

Palette Cj

MSB

LSB

MSB

LSB

MSB

j=0~7

CPU access data

X address :00H

Gradation palette

Gradation control circuit

SEGSA3

SEGSB3

Palette Aj

Palette Bj

SEGSC3

Palette Cj

MSB

LSB

MSB

LSB

MSB

GLSB circuit

j=0~7

CPU access data

Latched data

X address :03H

HM17CM256 데이터시트(PDF) 37 Page - Hynix Semiconductor

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