EM65568 ELAN Microelectronics Corp, EM65568 Datasheet - Page 21

• Manufacturer Part Number: EM65568
• Description: 130 Com/ 128 Seg 4096 Color Stn Lcd Driver
• Manufacturer: ELAN Microelectronics Corp

7.
7.1 MPU Interface
7.1.1 Selection of Interface Type
The EM65568 transfers data through 8-bit parallel I/O (D7-D0), 16-bit parallel I/O (D15-D0) or serial data input (SDA, SCL).
The parallel interface or serial interface can select by state of P/S pin. When select serial interface, data reading cannot be
performed, only data writing can operate.
7.1.2 Parallel Input
When parallel interface is selected with the P/S pin, the EM65568 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, either the 80-family MPU interface or the 68-family MPU interface can
be selected with the m86 pin.
M86
7.1.3 Read/Write functions of Register and display RAM
The EM65568 have four read/write functions at parallel interface mode. Each read/write function select by combinations of RS,
RDB and WRB signals.
7.1.4 Serial Interface
EM65568 has two types serial interface. One is a 3-wires type serial interface; other one is a 4-wires type serial interface. The
3-wire or 4-wire is determined by SMODE pin.
SMODE = “L”: 4-wires serial interface
SMODE = “H”: 3-wires serial interface
7.1.5 4 Wires Serial Interface
When chip select is active (CSB = “L”), 4-wires type serial interface can work through the SDA and SCL input pins. When
chip select is inactive (CSB = “H”), the internal shift register and counter are reset in the initial condition. Serial data SDA are
input sequentially in order of D7 to D0 at the rising of serial clock (SCL) and are converted into 8-bit parallel data (by serial to
parallel conversion) at the rising edge of the 8
whether are serial data inputs (SDA) are display data or control register data is judged by input to RS pin.
* This specification is subject to be changed without notice.
RS
H
L
1
1
0
0
P/S
H
L
Functional Description
68-family MPU
80-family MPU
I/F Type
Parallel
68-family
Serial
MPU Type
R/WB
1
0
1
0
CSB
CSB
CSB
RDB
0
1
0
1
CSB
CSB
CSB
80-family
RS
RS
RS
RS
RS
RS
WRB
RDB
RDB
1
0
1
0
-
th
serial clock, being processed in accordance with the data. The identification
RDB
RDB
E
WRB
WRB
Read internal Register
Write internal Register
Read display data
Write display data
-
130 COM/ 128 SEG 4096 Color STN LCD Driver
R/WB
WRB
WRB
M86
M86
21
-
Function
D7~D0 (D15~D0)
D0~D7 (D15~D0)
SDA
SDA
-
Data
SCL
SCL
-
D7~D0 (D15~D0)
Data
-
2005/3/8 (V1.2)
EM65568