HM17CM256 HYNIX [Hynix Semiconductor], HM17CM256 Datasheet - Page 32

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

HM17CM256
(12) GRADATION LSB CONTROL
(13) GRADATION PALETTE
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gradation display mode.
gradation palette register among 32-level gradation palettes. Segment driver outputs are set by
selected 8-level gradation palette.
segment driver outputs, SEGAi(0 127), SEGBi(0 127), and SEGCi(0 127) .
consists of a 5-bit register, selecting 8 gradations from the 32 gradation pattern.
by GLSB.
successive 3 bits of data and that for 4-gradation display using successive 2 bits of data.
area and 1 bit supplemented by the gradation LSB circuit, and then selects 4 gradations from 8-
gradations.
level of 0 regardless of gradation LSB register, when 2 bits of data on the display RAM are “00”.
When 2 bits of data on the display RAM is “11”, a gradation level of 7/7 is selected regardless of
gradation LSB register.
display RAM and the gradation LSB register.
RAM for all the 4-gradation segment drivers.
This IC has two gradation display modes, the fixed gradation display mode and the variable
Select mode by setting the gradation display mode register (PWM command) to the purpose.
To select the best gradation level suited to LCD panel at variable gradation display mode, use the
The gradation palette register provides three registers ( palette Aj, Bj, and Cj : j=0 7 ) for the
Segment driver selects 4 gradations among 8 gradation by 2 bits wrote-in RAM and 1bit calibrated
At 256 colors input mode, this IC provides segment driver output for 8-gradation display using
The segment driver output for the 4-gradation display uses 2 bits written to the corresponding RAM
At fixed gradation mode, the segment driver output for the 4-gradation display result in a gradation
One bit of data is supplemented by setting the gradation LSB register (GLSB).
For this register, the bit information specified for only one time setting is used as the LSB of the
Gradation LSB = “0”: Set 0 as the LSB of the RAM for 4-gradation segment drivers.
Gradation LSB = “1”: Set 1 as the LSB of the RAM for 4-gradation segment drivers.
gradation level table (MON=”1”, Black & white mode)
(MSB)RAM data (LSB)
0
0
0
0
1
1
1
1
PWM=”0” : variable gradation mode among 32-level gradations.
PWM=”1” : fixed 8 gradation mode
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
The other gradation levels are selected depending on 2 bits of data on the
Gradation level
0
0
0
0
1
1
1
1
0
0
1
1
RAM data
* : Don’t Care
0
1
0
1
GLSB
*
*
*
*
Gradation level
0
0
1
1
Each register