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8051 port functions

  Shared By: Ludkhannah Fischer    Date: Apr 02    Category: Assembly Language    Views: 2009


Ports Function

Port 0 (Pin 32-39) - Dual-purpose port - 1. general purpose I/O Port. 2. multiplexed address & data bus Open drain outputs

Port 1 (Pin 1-8) - Dedicated I/O port – Used solely for interfacing to external devices Internal pull-ups

Port 2 (Pin 21-28) - Dual-purpose port- 1. general purpose I/O port. 2. a multiplexed address & data bus. Internal pull-ups

Port 3 (Pin 10-17) - Dual-purpose port- 1. general purpose I/O port. 2. pins have alternate purpose related to special features of the 8051 Internal pull-ups


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