EM65570
68COM/ 98SEG 65K Color STN LCD Driver
7.1.3 Parallel Input
When the parallel interface is selected with the P/S pin, the EM65570 allows data to be
transferred in parallel to an 8-bit/16-bit MPU through the data bus. For the 8-bit/16-bit
MPU, you can use the M86 pin to select either the 80-family or the 68-family MPU
interface.
M86
H
MPU Type
CSB
CSB
CSB
RS
RS
RS
RDB
E
WRB
R/WB
WRB
Data
68-family MPU
80-family MPU
D7~D0 (D15~D0)
D0~D7 (D15~D0)
L
RDB
7.1.4 Read/Write Functions of Register and Display RAM
The EM65570 have four read/write functions in parallel interface mode. Each
read/write function is selected with the combinations of RS, RDB, and WRB signals.
80-Family
68-Family
R/WB
RS
Function
RDB
RDB
1
1
0
0
1
0
1
0
0
1
0
1
1
0
1
0
Read internal Register
Write internal Register
Read display data
Write display data
7.1.5 Serial Interface
The EM65570 has two types of serial interfaces, i.e, 3-wire and 4-wire serial interfaces.
Use the SMODE pin to select the serial interface type.
SMODE = “L”: 4-wire serial interface
SMODE = “H”: 3-wire serial interface
7.1.5.1 4-Wire Type Serial Interface
When the chip select is active (CSB = “L”), the 4-wire type serial interface works
through the SDA and SCL input pins. When chip select is inactive (CSB = “H”), the
internal shift register and counter are reset to the initial condition. Serial data SDA are
input sequentially in the order of D7 to D0 at the rising edge of the serial clock (SCL).
The RS pin determines whether serial data input (SDA) is used as display RAM data or
as control register data.
RS = “L”: display RAM data
RS = “H”: control register data
Product Specification (V1.0) 09.05.2005
• 17
(This specification is subject to change without further notice)
ELAN [ ELAN MICROELECTRONICS CORP ]
