ST7565S
System Bus Connection Pins
Pin Name
I/O Function
This is an 8-bit bi-directional data bus that connects to an 8-bit or 16-bit standard MPU
No. of Pins
data bus.
D5 to D0
D6 (SCL)
D7 (SI)
When the serial interface is selected (P/S = “L”) :
D7 : serial data input (SI) ; D6 : the serial clock input (SCL).
D0 to D5 are set to high impedance.
I/O
8
When the chip select is not active, D0 to D7 are set to high impedance.
This is connect to the least significant bit of the normal MPU address bus, and it
determines whether the data bits are data or a command.
A0 = “H”: Indicates that D0 to D7 are display data.
A0
I
1
A0 = “L”: Indicates that D0 to D7 are control data.
When /RES is set to “L,” the settings are initialized.
The reset operation is performed by the /RES signal level.
/RES
I
I
1
2
/CS1
CS2
This is the chip select signal. When /CS1 = “L” and CS2 = “H,” then the
chip select becomes active, and data/command I/O is enabled.
• When connected to an 8080 MPU, this is active LOW.
(E) This pin is connected to the /RD signal of the 8080 MPU, and the ST7565S series
data bus is in an output status when this signal is “L”.
• When connected to a 6800 Series MPU, this is active HIGH.
This is the 6800 Series MPU enable clock input terminal.
/RD
(E)
I
1
• When connected to an 8080 MPU, this is active LOW.
(R/W) This terminal connects to the 8080 MPU /WR signal. The signals on the data bus
are latched at the rising edge of the /WR signal.
• When connected to a 6800 Series MPU:
This is the read/write control signal input terminal.
When R/W = “H”: Read.
/WR
(R/W)
I
I
1
1
When R/W = “L”: Write.
This is the MPU interface switch terminal.
C86 = “H”: 6800 Series MPU interface.
C86 = “L”: 8080 MPU interface.
C86
This is the parallel data input/serial data input switch terminal.
P/S = “H”: Parallel data input.
P/S = “L”: Serial data input.
The following applies depending on the P/S status:
P/S
“H”
“L”
Data/Command
Data
Read/Write
/RD, /WR
Write only
Serial Clock
X
P/S
I
1
A0
A0
D0 to D7
SI (D7)
SCL (D6)
When P/S = “L”, D0 to D5 fixed “H”.
/RD (E) and /WR (R/W) are fixed to either “H” or “L”.
With serial data input, It is impossible read data from RAM.
Ver 0.6c
20/72
2009/09/07
SITRONIX [ SITRONIX TECHNOLOGY CO., LTD. ]
