EM65570
68COM/ 98SEG 65K Color STN LCD Driver
8.2.14 RAM Data Length Set
D7 D6 D5 D4 D3
D2 D1
D0
CSB RS RDB WRB RE2 RE1 RE0
0
0
1
1
C256 GLSB ABS WLS
0
1
1
0
0
0
1
(At the time of reset: {C256, GLSB, ABS, WLS} = 0H, read address: 3H)
The WLS register selects data bus size for accessing from MPU.
WLS = “0”: The data bus size is 8-bit in width
WLS = “1”: The data bus size is 16-bit in width
When MPU accesses the control register using the 16-bit bus, high byte data is
ignored.
ABS
ABS= “0”: normal mode
ABS= “1”: change corresponding bit from the input data bus
GLSB
In 256-color mode for segment driver of 4-gradation display, select 4 gradations from 8
gradations using the 2 bits written to the corresponding RAM area and the 1 bit
supplemented by the gradation LSB circuit. Supplement the 1 bit of data by setting the
gradation LSB register (GLSB).
Gradation LSB = “0”: Selects 0 as the LSB information on the RAM for the 4-gradation
segment driver.
Gradation LSB = “1”: Selects 1 as the LSB information on the RAM for 4-gradation
segment driver.
C256
C256= “0”: 4096-color mode
C256= “1”: 256-color mode
NOTE
When you use C256, you can NOT set 65K to 1.
8.2.15 RAM Data Writing Select Control
D7 D6 D5 D4 D3
D2
D1
D0
CSB RS RDB WRB RE2 RE1 RE0
0
1
0
0
WBS RDWS2 RDWS1 RDWS0
0
1
1
0
0
0
1
(At the time of reset: {WBS, RDWS2, RDWS1, RDWS0} = 0H, read address: 4H)
The WBS bit selects the byte writing sequence while displaying RAM data.
WBS= 0: Write low byte first
WBS= 1: Write high byte first
The RDWS[2:0] selects the RAM data writing mode shown in the following figure.
Product Specification (V1.0) 09.05.2005
(This specification is subject to change without further notice)
• 69
ELAN [ ELAN MICROELECTRONICS CORP ]
