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M30802FC

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

MITSUBISHI ELECTRIC  

Udnedveerlopment

Preliminary Specifications REV.B

Specifications in this manual are tentative

Pin Description

and

subject

to

change.

M16C/80

SINGLE-CHIP

Mitsubishi microcomputers

(144-pin version) group

16-BIT CMOS MICROCOMPUTER

Pin Description

Pin name

VCC, VSS

CNVSS

Signal name

Power supply

input

CNVSS

I/O type

Input

RESET

XIN

XOUT

BYTE

Reset input

Clock input

Clock output

Input

Input

Output

External data Input

bus width

select input

Function

Supply 4.2 to 5.5 V to the VCC pin. Supply 0 V to the VSS pin.

This pin switches between processor modes. Connect it to the VSS

when operating in single-chip or memory expansion mode after reset.

Connect it to the VCC when in microprocessor mode after reset.

A “L” on this input resets the microcomputer.

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.

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”. When

not using the external bus,connect this pin to VSS.

AVCC

Analog power

supply input

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

pin to VCC.

AVSS

VREF

P00 to P07

Analog power

supply input

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

pin to VSS.

Reference

Input

voltage input

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

I/O port P0

Input/output

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

register that allows the user to set each pin for input or output

individually. When set for input in single chip mode, the user can

specify in units of four bits via software whether or not they are tied to a

pull-up resistance. In memory expansion and microprocessor mode,

an built-in pull-up resistance cannot be used. However, it is possible to

select pull-up resistance presence to the usable port as I/O port by

setting.

D0 to D7

P10 to P17

D8 to D15

I/O port P1

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

Input/output This is an 8-bit I/O port equivalent to P0. P15 to P17 also function as

external interrupt pins as selected by software.

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

P20 to P27

A0 to A7

A0/D0 to

A7/D7

I/O port P2

P30 to P37

A8 to A15

A8/D8 to

A15/D15

I/O port P3

MA0 to MA7

Input/output This is an 8-bit I/O port equivalent to P0.

Output

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

Input/output If a multiplexed bus is set, these pins input and output data (D0–D7) and

output 8 low-order address bits (A0–A7) separated in time by

multiplexing.

Input/output This is an 8-bit I/O port equivalent to P0.

Output

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

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

input and output data (D8–D15) and output 8 middle-order address bits

(A8–A15) separated in time by multiplexing.

Output

If accessing to DRAM area, these pins output row address and column

address separated in time by multiplexing.

7

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