HM17CM256 datasheet(44/111 Pages) HYNIX

44 / 111 page

HM17CM256

- 44 -

When using partial display function, the display duty can be selected among 1/17, 1/26, 1/32, 1/38,

1/47, 1/66, 1/77 by setting the LCD duty set command.

The display states such as LCD driving bias ratio, LCD Driving voltage, electric volume setting

value, boosting coefficient should be optimized to the selected LCD and display duty.

(29) DISCHARGE CIRCUIT

The discharge circuit of voltage(VLCD, V1~V4) stabilization capacitor is built in the HM17CM256.

To discharge the capacitors, set the DIS register to “1” or set the RES terminal to “0”. When built-

in power supply circuit is used, built-in power supply circuit should be disabled before discharging of

the capacitor is executed. When external power supply(VLCD, V1~V4, VOUT) is used, external power

supply should be turned off before discharging of the capacitor is executed. Do not turn on the

internal power supply and external power supply (VLCD, V1~V4, VOUT) during discharging is executed.

(30) RESET CIRCUIT

HM17CM256 is initialized as following description when RES terminal is set to “L”.

INITIAL SETTING CONDITION (default setting)

display RAM

:unknown

X address

:00H set

Y address

:00H set

display start line

:1 line value 0H

display ON/OFF

:display OFF

positive/negative

:positive

display duty ratio

:1/82

n line inversion

:n inversion disable

COM shift direction

:COM0

→ COM

79, COMI0, COMI1

10.

increment mode

:increment OFF

11.

REF mode

:positive

12.

data SWAP mode

:OFF

13.

electric volume

:(0, 0, 0, 0, 0, 0, 0)

14.

power circuit

:OFF

15.

display mode :gradation display mode

16.

bias ratio

:1/10 bias

17.

gradation palette 0

:(0, 0, 0, 0, 0)

18.

gradation palette 1

:(0, 0, 1, 0, 1)

19.

gradation palette 2

:(0, 1, 0, 1, 0)

20.

gradation palette 3

:(0, 1, 1, 1, 0)

21.

gradation palette 4

:(1, 0, 0, 0, 1)

22.

gradation palette 5

:(1, 0, 1, 0, 1)

23.

gradation palette 6

:(1, 1, 0, 1, 0)

24.

gradation palette 7

:(1, 1, 1, 1, 1)

25.

gradation mode

:variable mode

26.

GLSB

:"0"

27.

RAM data length

:8 bit mode

28.

discharge register

:"0"

Usually RES terminal is connected reset terminal of CPU, so that the chip can be initialized

simultaneously with CPU. HM17CM256 should be initialized when the power is on.

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