EM65570 ELAN Microelectronics Corp, EM65570 Datasheet - Page 25

• 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)
7.2 Writing Data to Display RAM and Control Register
7.3 Internal Display RAM and Register Read
for the RS selection which selects the accessed object.
„ RS = “L”: Display RAM data
„ RS = “H”: Control register data
of the 68-family MPU, data is written at the falling edge of signal E.
7.2.1 Writing Data Operation
7.3.1 Read Display RAM Operation
A one-time dummy read operation is required to perform the display RAM read
operation. The designated address data are not output to read operation immediately
after the address is set to AX or AY register, but are output when the second data read
is performed. Dummy read is always required once after the address is set and the
write cycle begins.
The procedure of writing data to the display RAM and Control Register is similar except
In the case of the 80-family MPU, data is written at the rising edge of WRB
(D15~D0)
(D15~D0)
D7~D0
D7~D0
WRB
WRB
RDB
RS
RS
Figure 7-4 Writing Data to Display RAM & Control Register Operation
Address set (AX,AY)
Address = n
Write to control register
Data0
n
Figure 7-5 Read Display RAM Operation
Data1
Dummy
***
Read
Data Read
Address=n
68COM/ 98SEG 65K Color STN LCD Driver
Data2
n
Address=n+1
Data Read
Data3
n+1
Write to display RAM
Address=n+2
Data Read
Data4
n+2
.
Data5
In the case
EM65570
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