em65570sagh ELAN Microelectronics Corp, em65570sagh Datasheet - Page 26

• Manufacturer Part Number: em65570sagh
• Description: 68com/98seg 65k Color Stn Lcd Drivers
• Manufacturer: ELAN Microelectronics Corp

EM65570S
68COM/98SEG 65K Color STN LCD Drivers
20 x
7.4 16-bit Data Access to Display RAM
Read display RAM operation
The EM65570S can read the control registers, in case of control register read
operation, data bus upper nibble (D7-D4) use for register address (0 to FH)
maximum, 16 registers can access directly
registers
number to access
is need 4-steps to read the specific register in maximum case.
The EM65570S correspond to 8-bits and 16-bits bus size access.
The data bus size can select by WLS register.
For 6-bit access mode, low-byte data bus (D7~D0) is used to access the control
register. High byte data bus (D15~D8) are not used in internal circuit
register is read using 16-bit bus
“H”.
(D0~D15)
D0~D7
W RB
(1) Write 04H to RE register for access to RA register.
(2) Writes specific register address to RA register.
(3) Write specific register bank to RE register.
(4) Read specific register contents.
WLS = “0”: 8-bit bus size
WLS = “1”: 16-bit bus size
RDB
RS
.
Therefore, EM65570S has register bank control
D0~D7
Address set (AX,AY)
WRB
RDB
Address = n
RS
.
n
And the RE address is 0FH, in any bank can access RE register
Bank number write
Figure 7-4 Read display RAM operation
Figure 7-5 Register Read Operation
to RE for RA
04H
Dummy
***
Read
,
register values output to D3-D0 and D15-D4 output
(This specification is subject to change without further notice)
Address write
Data Read
Address=n
addr
to RA
n
.
But number of register is more than 16
Product Specification (V1.0) 04.18.2006
Bank number
Address=n+1
write to RE
Data Read
bank
n+1
.
The RE register is set bank
read specific
Address=n+2
Data Read
register
data
n+2
.
When the control
.
In
.
It