M30620FCAFP datasheet(564/615 Pages) RENESAS

564 / 615 page

External ROM

Mitsubishi microcomputers

M16C / 62A Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

2-247

5.2 Pin Description

Tables 5.2.1 and 5.2.2 show the pin description.

Signal name

VCC, VSS

Power supply

input

Supply 2.7 to 5.5 V to the VCC pin. Supply 0 V to the VSS pin.

Function

AVCC

Analog power

supply input

This pin is a power supply input for the A-D converter. Connect this

pin to VCC.

Pin name

CNVSS

Connect this pin to VCC.

Input

XIN

XOUT

Clock input

Clock output

These pins are provided for the main clock generating circuit. Connect

a ceramic resonator or crystal between the XIN and the XOUT pins. To

use an externally derived clock, input it to the XIN pin and leave the

XOUT pin open.

Input

Output

BYTE

External data

bus width

select input

This pin selects the width of an external data bus. A 16-bit width is

selected when this input is “L”; an 8-bit width is selected when this

input is “H”. This input must be fixed to either “H” or “L”.

Input

VREF

Reference

voltage input

This pin is a reference voltage input for the A-D converter.

Input

P10 to P17

I/O port P1

This is an 8-bit CMOS I/O port. It has an input/output port direction

individually.

Input/output

I/O type

AVSS

This pin is a power supply input for the A-D converter. Connect this

pin to VSS.

Analog power

supply input

P40 to P47

I/O port P4

This is an 8-bit I/O port equivalent to P1.

Input/output

Output

CS0 to CS3,

A16 to A19

These pins output CS0–CS3 signals and A16–A19. CS0–CS3 are chip

select signals used to specify an access space. A16–A19 are 4 high-

order address bits.

Reset input

A “L” on this input resets the microcomputer.

Input

RESET

D0 to D7

When set as a separate bus, these pins input and output data (D0–D7).

Input/output

Data bus

D8 to D15

When set as a separate bus, these pins input and output data (D8–D15).

Input/output

Data bus

A0 to A7

These pins output 8 low-order address bits (A0–A7).

Output

Address bus

A0,

A1/D0 to

A7/D6

If the external bus is set as a 16-bit wide multiplexed bus, these pins

input and output data (D0–D6) and output address (A1–A7) separated

in time by multiplexing. They also output address (A0).

Output

Input/output

A0/D0 to

A7/D7

If the external bus is set as an 8-bit wide multiplexed bus, these pins

input and output data (D0–D7) and output 8 low-order address bits

(A0–A7) separated in time by multiplexing.

Input/output

Address bus/

data bus

A8/D7,

A9 to A15

If the external bus is set as a 16-bit wide multiplexed bus, these pins

input and output data (D7) and output address (A8) separated in time

by multiplexing. They also output address (A9–A15).

Input/output

Output

A8 to A15

These pins output 8 middle-order address bits (A8–A15).

Output

Address bus

Address bus/

data bus

Table 5.2.1. Pin Description (1)

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