ST7565S
Ver 0.3c
20/72
2002/07/22
System Bus Connection Pins
Pin Name
I/O
Function
No. of Pins
D5 to D0
D6 (SCL)
D7 (SI)
I/O
This is an 8-bit bi-directional data bus that connects to an 8-bit or 16-bit
standard MPU data bus.
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.
When the chip select is not active, D0 to D7 are set to high impedance.
8
A0
I
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 = “L”: Indicates that D0 to D7 are control data.
1
/RES
I
When /RES is set to “L,” the settings are initialized.
The reset operation is performed by the /RES signal level.
1
/CS1
CS2
I
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.
2
/RD
(E)
I
• 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.
1
/WR
(R/W)
I
• 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.
When R/W = “L”: Write.
1
C86
I
This is the MPU interface switch terminal.
C86 = “H”: 6800 Series MPU interface.
C86 = “L”: 8080 MPU interface.
1
P/S
I
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:
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 .
P/S
Data/Command
Data
Read/Write Serial Clock
“H”
A0
D0 to D7
/RD, /WR
X
“L”
A0
SI (D7)
Write only
SCL (D6)
1
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