Mpu Interface; Connection To The System Bus; 80-Series Mpu - Epson S1D13700 User's & Technical Manual

6 MPU I
6.1

Connection to the System Bus

The S1D13700 uses a combination of CNF2/3/4, AB15–0, RD#, WR#, and CS# to discriminate information
supplied to it via the system data bus as described in Section 2.2 "Pin Functions" on page 9.
In indirect interface mode, AB0 generally is connected to the least significant bit of the system address bus.
CNF2 and CNF3 are provided for changing the functions of S1D13700 pins 58 and 59 to enable the chip to be
connected directly to the 80 or 68-series MPU bus, and are pulled high or low through a resistor when in use.
For the 80-series MPU, the S1D13700 should normally be mapped in I/O space.
6.1.1

80-series MPU

<Direct access for the 80-series interface>
AB15
CNF4
– AB1
0 0or1
0 0or1
<Indirect access for the 80-series interface>
AB15
CNF4
– AB1
1 —
1 —
1 —
1 —
6.1.2 68-series MPU
<Direct access for the 68-series interface>
AB15
CNF4
– AB1
0 0or1
0 0or1
<Indirect access for the 68-series interface>
AB15
CNF4
– AB1
1 —
1 —
1 —
1 —
S1D13700 Technical Manual
NTERFACE
AB0 RD# WR#
0or1 0 1 Read from command/parameter registers
0or1 1 1 Write to command/parameter registers
AB0 RD# WR#
0 0 1
1 0 1 Data (display data and cursor address) read
0 1 0 Data (display data and parameter) write
1 1 0 Command write (code only)
WR# RD#
AB0
(E)
(R/W#)
0or1 1 1 Read from command/parameter registers
0or1 0 1 Write to command/parameter registers
WR# RD#
AB0
(E)
(R/W#)
0 1 1
1 1 1 Data (display data and cursor address) read
0 0 1 Data (display data and parameter) write
1 0 1 Command write (code only)
Function
Function
Function
Function
EPSON

6: MPU INTERFACE

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