HM17CM256 HYNIX [Hynix Semiconductor], HM17CM256 Datasheet - Page 44

• Manufacturer Part Number: HM17CM256
• Description: 128XRGBX82 OUTPUT LCD DRIVER IC with built-in RAM
• Manufacturer: HYNIX [Hynix Semiconductor]

HM17CM256
(29) DISCHARGE CIRCUIT
(30) RESET CIRCUIT
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1/47, 1/66, 1/77 by setting the LCD duty set command.
value, boosting coefficient should be optimized to the selected LCD and display duty.
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(V
supply should be turned off before discharging of the capacitor is executed. Do not turn on the
internal power supply and external power supply (V
simultaneously with CPU. HM17CM256 should be initialized when the power is on.
When using partial display function, the display duty can be selected among 1/17, 1/26, 1/32, 1/38,
The display states such as LCD driving bias ratio, LCD Driving voltage, electric volume setting
The discharge circuit of voltage(V
To discharge the capacitors, set the DIS register to “1” or set the RES terminal to “0”. When built-
HM17CM256 is initialized as following description when RES terminal is set to “L”.
Usually RES terminal is connected reset terminal of CPU, so that the chip can be initialized
INITIAL SETTING CONDITION (default setting)
10. increment mode
11. REF mode
12. data SWAP mode
13. electric volume
14. power circuit
15. display mode :gradation display mode
16. bias ratio
17. gradation palette 0
18. gradation palette 1
19. gradation palette 2
20. gradation palette 3
21. gradation palette 4
22. gradation palette 5
23. gradation palette 6
24. gradation palette 7
25. gradation mode
26. GLSB
27. RAM data length
28. discharge register
1. display RAM
2. X address
3. Y address
4. display start line
5. display ON/OFF
6. positive/negative
7. display duty ratio
8. n line inversion
9. COM shift direction
:unknown
:00
:00
:1 line value 0
:display OFF
:positive
:1/82
:n inversion disable
:COM
:increment OFF
:positive
:OFF
:(0, 0, 0, 0, 0, 0, 0)
:OFF
:1/10 bias
:(0, 0, 0, 0, 0)
:(0, 0, 1, 0, 1)
:(0, 1, 0, 1, 0)
:(0, 1, 1, 1, 0)
:(1, 0, 0, 0, 1)
:(1, 0, 1, 0, 1)
:(1, 1, 0, 1, 0)
:(1, 1, 1, 1, 1)
:variable mode
:"0"
:8 bit mode
:"0"
H
H
LCD
set
set
0
, V
1
COM
~V
H
4
) stabilization capacitor is built in the HM17CM256.
79
, COMI
LCD
0
, V
, COMI
1
~V
LCD
4
, V
1
, V
OUT
1
~V
) during discharging is executed.
4
, V
OUT
) is used, external power