em65567 ELAN Microelectronics Corp, em65567 Datasheet - Page 20

• Manufacturer Part Number: em65567
• Description: Com/ Color Driver
• Manufacturer: ELAN Microelectronics Corp

When serial interface is used, access is only made for 8-bit data transfer.
7.2 Data write to Display RAM and Control Register
RS = “L”: Display RAM data
RS = “H”: Control register data
In the case of the 80-family MPU, the data is written at the rising edge of WRB. In the case of the 68-family MPU, the datais
written at the falling edge of signal E.
Data write operation
7.3 Internal Register Read
In the case of display RAM read operation, need dummy read one time. The designated address data are not output to read
operation immediately after the address set to AX or AY register, but are output when the second data read. Dummy read is
always required one time after address set and write cycle.
Read display RAM operation
* This specification is subject to be changed without notice.
The data write to display RAM and Control Register use almost same procedure, only different setting of RS that select
access object.
W rie to w hich
CSB
SDA
SCL
RS
(D 0~D 15)
(D 0~D 15)
D 0~D 7
D 0~D 7
W R B
R D B
W R B
R S
R S
Address set (AX,AY)
1
Address = n
D7
W rie to control register
n
Data0
Figure 7. Read display RAM operation
D6
2
Figure 6. Data write operation
Dummy
***
Read
Data1
D5
3
Figure 4. Serial Interface
Data Read
Address=n
D4
4
Data2
n
20
66 COM/ 96 SEG 256 Color STN LCD Driver
D3
5
Address=n+1
Data Read
n+1
Data3
D2
6
W rie to display R AM
Address=n+2
Data Read
7
D1
n+2
Data4
valid
D0
8
2003/1/9 (V0.1)
EM65567