By: Masud-ul-Hasan
11
Port 0 (pin 32-39)
-Dual purpose I/O port.
-In min. component design, it is used as a general purpose I/O port.
•- In larger designs with external memory, it becomes a multiplexed data bus:
–Low byte of address bus, strobed by ALE.
–8-bit instruction bus, strobed by PSEN.
–8-bit data bus, strobed by WR and RD.