Toshiba TLCS-90 Series Data Book page 187

TOSHIBA
PIN NAMES AND PIN DESCRIPTION
PROG (Input)
TMP82C43P
Clock input.
A
high to low transistion on PROG signifies that address and
control are ayailable on P20-23, and a low to high transition signifies
that data is available on P20-23.
CS (Input)
Chip Select Input. A high on CS inhibits any change of output or internal
status.
P20-23 (Input/Output, 3-state)
Four (4) bit bi-directional port contains the address and control bits on a
high to low transition of PROG. During a low to high transition contains
the data for a selected output port if a write operation, or the data from
a selected port before the low to high transition if a read operation.
P40-43,
PSO-S3,
P60-63, P70-73 (Input/Output, 3-state)
Four (4) bit bi-directional I/O ports. May be programmed to be input (during
read), lo\v impedance latched output (after write) or a 3-state (after read).
Data on pins P20-23 may be directly wTitten, ~~Ded or ORed with previous data.
VCC (Power)
+5 volt supply
GND (Power)
o
volt supply
FUNCTIONAL DESCRIPTION
General Operation
The TMP82C43P contains four 4-bit I/O ports which serve as an extension of
the on-chip I/O and are addressed as ports 4-7. The following operations
may be performed on these ports.
o
Transfer accumulator to port
o
Transfer port to accumulator
o
AND accumulator to port
o
OR
accumulator to port
MCU48-177