Specifications

EPSON 5–31
SED1225 Series
SED1225
Series
MPU INTERFACES (REFERENCE)
The SED1225 can be connected to the 80-series or 68-
series MPU. Also, it can operate with a less number of
signal lines via the serial interface.
If the MPU buses and ports are set to high impedance for
a certain time due to RESET, the RESET signal must be
entered in the SED1225 after the SED1225’s inputs have
been determined.
V CC
A0
A1 to A7
D0 to D7
WR
RES
GND
MPU
Decoder
XRES
V
DD
A0
XCS
D0 to D7
RES
V
SS
C86
PS
IF
SED1225
IORQ
XWR
V CC
A0
A1 to A7
D0 to D7
WR
RES
GND
MPU
Decoder
XRES
V
DD
A0
XCS
D0 to D7
RES
V
SS
C86
PS
IF
SED1225
IORQ
XWR
V CC
RES
Port 4
Port 3
Port 2
Port 1
GND
MPU
XRES
V
DD
V DD
or V SS
A0
XCS
RES
V
SS
C86, XWR
D0 to D5
PS
IF
SED1225
SI
SCL
80-Series MPU
68-Series MPU
Serial Interface