CHAPTER 1 INTRODUCTION
(o) Ports
As shown below, the following ports have general-purpose port functions and control pin functions.
Port
I/O
7-bit I/O
Port Function
Control Function
P0
P3
P4
P5
P7
P9
General-purpose port NMI, external interrupt, timer output
Serial interface, timer I/O
8-bit I/O
3-bit I/O
6-bit I/O
8-bit input
9-bit I/O
4-bit I/O
2-bit I/O
4-bit I/O
16-bit I/O
Serial interface
Serial interface, timer I/O, key interrupt function, real-time output function
A/D converter analog input
Serial interface, timer output, external interrupt, key interrupt function
External bus interface
PCM
PCS
PCT
PDL
Chip select output
External bus interface
External address/data bus
User’s Manual U15862EJ3V0UD
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NEC [ NEC ]
