32C87 datasheet(19/91 Pages) RENESAS

19 / 91 page

M32C/87 Group (M32C/87, M32C/87A, M32C/87B)

1. Overview

REJ03B0127-0151 Rev.1.51 Jul 31, 2008

Page 19 of 85

1.5

Pin Functions

Table 1.15

Pin Functions (100-Pin and 144-Pin Packages) (1/4)

I: Input

O: Output I/O: Input and output

Type

Symbol

I/O

Type

Supply

Voltage

Description

Power supply

VCC1,VCC2

VSS

−−

Apply 3.0 to 5.5 V to pins VCC1 and VCC2, and 0 V to the VSS pin.

The input condition of VCC1

≥ VCC2 must be met.

Analog power

supply input

AVCC

AVSS

−

VCC1

Power supply input pins to the A/D converter and D/A converter.

Connect the AVCC pin to VCC1, and the AVSS pin to VSS.

Reset input

RESET

VCC1

The MCU is placed in the reset state while applying an “L” signal to

the RESET pin.

CNVSS

VCC1

This pin switches processor mode. Apply an “L” to the CNVSS pin

to start up in single-chip mode, or an “H” to start up in

microprocessor mode (mask ROM, flash memory version) and boot

mode (flash memory version).

External data

bus width

select input

BYTE

VCC1

This pin switches a data bus width in external memory space 3. A

data bus is 16 bits wide when the BYTE pin is held “L” and 8 bits

wide when it is held “H”. Fix to either “L” or “H”.

Apply an “L” to the BYTE pin in single-chip mode.

Bus control

Pins

D0 to D7

I/O

VCC2

Data (D0 to D7) input/output pins while accessing an external

memory space with separate bus.

D8 to D15

I/O

VCC2

Data (D8 to D15) input/output pins while accessing an external

memory space with 16-bit separate bus.

A0 to A22

VCC2

Address bits (A0 to A22) output pins.

A23

VCC2

Inverted address bit (A23) output pin.

A0/D0 to

A7/D7

I/O

VCC2

Data (D0 to D7) input/output and 8 low-order address bits (A0 to

A7) output are performed by time-sharing these pins while

accessing an external memory space with multiplexed bus.

A8/D8 to

A15/D15

I/O

VCC2

Data (D8 to D15) input/output and 8 middle-order address bits (A8

to A15) output are performed by time-sharing these pins while

accessing an external memory space with 16-bit multiplexed bus.

CS0 to CS3

VCC2

Chip-select signal output pins used to specify external devices.

WRL/WR

WRH/BHE

VCC2

WRL, WRH, (WR, BHE) and RD signal output pins. WRL and WRH

can be switched with WR and BHE by a program.

•WRL, WRH and RD are selected:

If external data bus is 16 bits wide, data is written to an even

address in external memory space while an “L” is output from the

WRL pin. Data is written to an odd address while an “L” is output

from the WRH pin. Data is read while an “L” is output from the

RD pin.

•WR, BHE and RD are selected:

Data is written while an “L” is output from the WR pin. Data is

read while an “L” is output from the RD pin. Data in odd address

is accessed while an “L” is output from the BHE pin. Select WR,

BHE and RD when an external data bus is 8 bits wide.

ALE

VCC2

ALE signal is used for the external devices to latch address signals

when the multiplexed bus is selected.

HOLD

VCC2

The MCU is placed in a hold state while an “L” signal is applied to

the HOLD pin.

HLDA

VCC2

The HLDA pin outputs an “L” while the MCU is placed in a hold

state.

RDY

VCC2

Bus is placed in a wait state while an “L” signal is applied to the

RDY pin.

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