EM65570
68COM/ 98SEG 65K Color STN LCD Driver
When writing to the control register, it is used directly by addressing D7~D4 of the data
bus. When reading, you must first set the RA register for the specific register address
before you can read specific register. Therefore, a 2-step procedure is required to
perform a read register operation. After reading, the specific register will output to
D3~D0 of the data bus. All nibbles, except D3~D0, of the data bus are all “H.” Access
to undefined register address area is prohibited. When RS is “L,” all read/write
operations are accessed to display RAM. Then the data bus does not include the
register address. When writing, D3~D0 data is written to the register designated at
D7~D4 on the rising edge of the WRB signal. When reading, the register can output to
data bus during RDB active period. The control register and display RAM have equal
access sequence
8.2.1 X Address Register (AX)
D7 D6 D5 D4 D3 D2 D1 D0
AX3 AX2 AX1 AX0
(At the time of reset: {AX3, AX2, AX1, AX0} = 0H, read address: 0H)
CSB RS RDB WRB RE2 RE1 RE0
0
0
0
0
0
1
1
0
0
0
0
D7 D6 D5 D4 D3 D2 D1 D0
AX7 AX6 AX5 AX4
CSB RS RDB WRB RE2 RE1 RE0
0
0
0
1
0
1
1
0
0
0
0
(At the time of reset: {AX7, AX6, AX5, AX4} = 0H, read address: 1H)
The AX register is set to the X-direction address of display RAM. In data setting,
command is divided into lower and upper sections at 4-bit of data each in order to
accommodate the required 8-bit of total data.
8.2.2 Y Address Register (AY)
D7 D6 D5 D4 D3 D2 D1 D0
AY3 AX2 AY1 AY0
(At the time of reset: {AY3, AY2, AY1, AY0} =0H, read address: 2H)
CSB RS RDB WRB RE2 RE1 RE0
0
0
1
0
0
1
1
0
0
0
0
D7 D6 D5 D4 D3 D2 D1 D0
AY6 AY5 AY4
CSB RS RDB WRB RE2 RE1 RE0
0
0
1
1
0
1
1
0
0
0
0
*
* Don’t Care
(At the time of reset: {AY6, AY5, AY4} =0H, read address: 3H)
The AY register is set to the Y-direction address of display RAM. In data setting,
command is divided into lower and upper sections at 4-bit and 3-bit of data respectively
in order to accommodate the required 7-bit total data. 00H to 43H are applicable to the
values for AY6 to AY0, but 44H to FFH are not applicable.
Product Specification (V1.0) 09.05.2005
(This specification is subject to change without further notice)
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ELAN [ ELAN MICROELECTRONICS CORP ]
