SED1565 EPSON [Epson Company], SED1565 Datasheet - Page 23

• Manufacturer Part Number: SED1565
• Description: Direct display of RAM data through the display data RAM
• Manufacturer: EPSON [Epson Company]

System Bus Connection Terminals
Pin Name
D7 to D0
(SI)
(SCL)
A0
RES
CS1
CS2
RD
(E)
WR
(R/W)
C86
P/S
I/O
I/O
I
I
I
I
I
I
I
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”), then D7 serves as the
serial data input terminal (SI) and D6 serves as the serial clock input
terminal (SCL). At this time, D0 to D5 are set to high impedance.
When the chip select is inactive, 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 = “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.
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.
• When connected to a 6800 Series MPU, this is active HIGH.
• When connected to an 8080 MPU, this is active LOW.
• When connected to a 6800 Series MPU:
This is the MPU interface switch terminal.
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 are HZ. D0 to D5 may be “H”, “L” or Open.
RD (E) and WR (P/W) are fixed to either “H” or “L”.
With serial data input, RAM display data reading is not supported.
P/S
“H”
This pin is connected to the RD signal of the 8080 MPU, and the
SED1565 series data bus is in an output status when this signal is “L”.
This is the 68000 Series MPU enable clock input terminal.
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.
This is the read/write control signal input terminal.
When R/W = “H”: Read.
When R/W = “L”: Write.
C86 = “H”: 6800 Series MPU interface.
C86 = “L”: 8080 MPU interface.
“L”
Data/Command
A0
A0
EPSON
D0 to D7
SI (D7)
Data
Function
Read/Write Serial Clock
Write only
RD, WR
SCL (D6)
SED1565 Series
No. of
Pins
8–21
8
1
1
2
1
1
1
1