ST7628
Read / Write execution control pin
MPU type
RW_WR
Description
Read / Write control input pin
RW = “H” : read
6800-series
RW
RW_WR
I
RW = “L” : write
Write enable clock input pin
The data on D0 to D15 are latched at the
rising edge of the /WR signal.
8080-series
/WR
When in the serial interface, connect it to VSS or VDD.
Read / Write execution control pin
MPU Type
E_RD
Description
Enable clock pin:
Write status: The data on D0 to D15 are latched at the
falling edge of the E signal.
6800-series
E
E_RD
I
Read status: The data on D0 to D15 are latched at the
rising edge of the E signal.
Read enable clock input pin
8080-series
/RD
The data on D0 to D15 are latched at the falling edge of
the /WR signal.
When in the serial interface, connect it to VSS or VDD.
They connect to the standard 8-bit or 16 bit MPU bus via the 8/16 –bit bi-directional bus.
When the following interface is selected and the /CS pin is high, the following pins become high
impedance.
D15 to D0
I/O
1. In 8-bit parallel: D15-D8 pins are in the state of high impedance should connect to VDD.
2. In 3-line/4-line interface D0 pad will be used for SI function
3. In 4-line interface D1 pad will be used for A0 function
4. In Serial interface: Unused pins are in the state of high impedance should connect to VDD.
SI is used to input serial data when the serial interface is selected.(3 line and 4 line)
It is used by “D0” pad , See Table 7.1.1
SI
I
SCL is used to input serial clock when the serial interface is selected.
The data is converted in the rising edge. (3 line and 4 line)
It is used by “A0” pad , See Table 7.1.1
SCL
TE
I
O
I
Tearing effect output.
Instruction selection Pin. There is a pull-high resistor between /EXT & VDD in ST7628.
When using normal instruction table, please let it open.
/EXT
When using extension instruction table, please add an external VSS on /EXT.
Note: 1. All of the microprocessor interface pin should not be floating on any operations.
2. Unused pins should connect to VDD(supply digital voltage)
Ver 1.4
14/213
2008/08
SITRONIX [ SITRONIX TECHNOLOGY CO., LTD. ]
