EM65570 ELAN Microelectronics Corp, EM65570 Datasheet - Page 75

• Manufacturer Part Number: EM65570
• Description: 68com / 98seg 65k Color Stn Lcd Driver
• Manufacturer: ELAN Microelectronics Corp

Product Specification (V1.0) 09.05.2005
(This specification is subject to change without further notice)
8.2.14 RAM Data Length Set
(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
Gradation LSB = “1”: Selects 1 as the LSB information on the RAM for 4-gradation
„ C256
C256= “0”: 4096-color mode
C256= “1”: 256-color mode
8.2.15 RAM Data Writing Select Control
(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.
D7 D6 D5 D4
D7
0
0
D6
1
0
0
D5
1
0 WBS RDWS2 RDWS1 RDWS0
D4
1
D3
C256 GLSB ABS WLS
D3
When you use C256, you can NOT set 65K to 1.
segment driver.
segment driver.
D2
D2
D1
D1
D0
NOTE
68COM/ 98SEG 65K Color STN LCD Driver
D0
CSB RS RDB WRB RE2 RE1 RE0
0
CSB RS RDB WRB RE2 RE1 RE0
0
1
1
1
1
0
0
0
0
EM65570
0
0
x 69
1
1