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M32171F3VFP

SINGLE-CHIP 32-BIT CMOS MICROCOMPUTER

Mitsumi 

2001-5-14 Rev.1.0

Mitsubishi Microcomputers

32171 Group

SINGLE-CHIP 32-BIT CMOS MICROCOMPUTER

Input/output Ports

The microcomputer has a total of 97 input/output ports

P0-P22. (However, P5 is reserved for future use, P14, P16,

and P18-P21 do not exist.) The input/output ports can be

used as input ports or output ports by setting uptheir direction

registers.

Each input/output port is a dual-function pin shared with

otherinternal peripheral I/O or external extended bus signal

lines. These pin functions are selected by using the chip op-

eration mode select or the input/output port operation mode

registers. These input/output ports are interfaced using a

dedicated power supply to allow for connections to the pe-

ripheral circuits operating with 5V or 3.3V.

Table 9 Outline of Input/output Ports

Item

Number of Port

Specification

Total 97 ports

P0 :

P1 :

P2 :

P3 :

P4 :

P6 :

P7 :

P8 :

P9 :

P10 :

P11 :

P12 :

P13 :

P15 :

P17 :

P22 :

P00 - P07

(8 lines)

P10 - P17

(8 lines)

P20 - P27

(8 lines)

P30 - P37

(8 lines)

P41 - P47

(7 lines)

P61 - P64

(4 lines)

P70 - P77

(8 lines)

P82 - P87

(6 lines)

P93 - P97

(5 lines)

P100 - P107

(8 lines)

P110 - P117

(8 lines)

P124 - P127

(4 lines)

P130 - P137

(8 lines)

P150, P153

(2 lines)

P174, P175

(2 lines)

P220, P221, P225 (3 lines)

Port function

The input/output ports can be set for input or ou_tp_u_t mode bitwise by using the input/output port

direction control register. (However, P64 is an SBI input-only port, and P221 is CAN input-only port.)

Pin function

Pin function

changeover

Dual-functions shared with peripheral I/O or external extended signals (or multi-functions shared with

peripheral I/Os which have multiple functions.)

P0 - P4 : Changed by setting CPU operation mode (MOD0 and MOD1 pins)

P6 - 22 : Changed by setting the input/output port operation mode register.

(However, peripheral I/O pin functions are selected using the peripheral I/O register.)

Note: Input/output ports P14, P16, and P18-P21 do not exist.

Table 10 CPU Operation Modes and P0-P4 Pin Functions

MOD0

VSS

MOD1

VSS

Operation mode

Single-chip mode

Pin functions of P0-P4

Input/output port pin

VSS

VCCE

VCCE

VSS

External extended mode

Processor mode (FP pin = VSS)

External extended signal pin

VCCE

VCCE

Reserved (use inhibited)

–

Note: VCCE connects to +5V or +3.3V, and VSS connects to GND.

18

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