M30620FCAFP datasheet(499/615 Pages) RENESAS

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Programmable I/O Ports

Mitsubishi microcomputers

M16C / 62A Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

2-182

(6) I/O functions of built-in peripheral devices

Table 2.16.1 shows relation between ports and I/O functions of built-in peripheral devices.

Port

Internal peripheral device I/O pins

I/O pins for serial I/O communication

I/O pins for serial I/O communication/Timer A I/O pins/Timer B input pin

P71

P80, P81

Timer A I/O pins

P82 to P84

Input pins for external interrupt

P86, P87

Sub-clock oscillation circuit I/O pins

P90 to P92

Timer B input pins

P93, P94

D-A converter output pins

P95, P96

A-D converter extended input pins

P97

A-D trigger input pin

P100 to P103

A-D converter input pins

P104 to P107

A-D converter input pins / key-input interrupt function input pins

Timer A I/O pins

P76 to P77

P15 to P17

Input pins for external interrupt

I/O pins for serial I/O communication/Timer A I/O pin

P70

P72 to P73

I/O pins for serial I/O communication/Timer A I/O pins/Three-phase motor

control output pins

Timer A I/O pins/Three-phase motor control output pins

P74 to P75

Table 2.16.1. Relation between ports and I/O functions of built-in peripheral devices

(7) Examples of working on non-used pins

Table 2.16.2 contains examples of working on non-used pins. There are shown here for mere ex-

amples. In practical use, make suitable changes and perform sufficient evaluation in compliance with

you application.

(a) Single-chip mode

Table 2.16.2. Examples of working on unused pins in single-chip mode

Pin name

Connection

Ports P0 to P10 (excluding P85)

XOUT (Note 2)

NMI

After setting for input mode, connect every pin to VSS or VCC via a

resistor; or after setting for output mode, leave these pins open.

(Note 1, Note 3)

Open

Connect to VCC via a resistor

AVSS, VREF, BYTE

Connect to VSS

If setting these pins in output mode and opening them, ports are in input mode until switched into

output mode by use of software after reset. Thus the voltage levels of the pins become unstable,

and there can be instances in which the power source current increases while the ports are in

input mode.

In view of an instance in which the contents of the direction registers change due to a runaway

generated by noise or other causes, setting the contents of the direction registers periodically by

use of software increases program reliability.

When an external clock is input to the XIN pin.

Output "L" if port P70 and P71 are set to output mode.

Port P70 and P71 are N channel open drain output.

Note 1:

Note 2:

Note 3:

AVCC

Connect to VCC

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