em65567 ELAN Microelectronics Corp, em65567 Datasheet - Page 19

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

7.
7.1 MPU Interface
7.1.1 Selection of Interface Type
The EM65567 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 EM65567 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.
7.1.3 Read/Write functions of Register and display RAM
The EM65567 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
The serial interface of EM65567 can accept inputs of SDA and SCL in the state of chip select (CSB=”L”). When not in the
state of chip select. 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.
After completing 8-bit data transferring, or when making no access, be sure to set serial clock input (SCL) to “L”. Cares of
SDA and SCL signals against external noise should be taken in board wiring. To prevent transfer error due to external noise,
release chip select (CSB = “H”) every completion of 8-bit data transferring.
* This specification is subject to be changed without notice.
P/S
M86
RS = “L”: display RAM data
RS = “H”: control register data
H
RS
L
H
L
1
1
0
0
Functional Description
I/F Type
Parallel
Serial
68-family MPU
80-family MPU
68-family
MPU Type
R/WB
1
0
1
0
CSB
CSB
CSB
RDB
0
1
0
1
CSB
CSB
CSB
RS
RS
RS
80-family
RDB
RDB
WRB
RS
RS
RS
-
1
0
1
0
th
serial clock, being processed in accordance with the data. The identification
RDB
RDB
WRB
WRB
Read internal Register
Write internal Register
Read display data
Write display data
E
-
R/WB
WRB
WRB
M86
M86
19
66 COM/ 96 SEG 256 Color STN LCD Driver
-
Function
SDA
SDA
D7~D0 (D15~D0)
D0~D7 (D15~D0)
-
Data
SCL
SCL
-
D7~D0 (D15~D0)
Data
-
2003/1/9 (V0.1)
EM65567