32171 datasheet(39/772 Pages) RENESAS

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1-13

32171 Group User's Manual (Rev.2.00)

Table 1.3.1 Description of the 32171 Pin Function (2/5)

Type

Pin Name Signal Name

Input/Output Function

Data

DB0-DB15 Data bus

Input/output These pins comprise 16-bit data bus to connect external devices. In write

bus

cycles, the valid byte positions to be written on the 16-bit data bus are

________ _______

output as BHW/BHE and BLW/BLE. In read cycles, data is always read

from the 16-bit data bus. However, when transferring to the internal circuit

of the M32R, only data at the valid byte positions are transferred.

Bus

___

CS0,

Chip select

Output

These pins comprise external device chip select signal. For

control

___

CS1

areas for which a chip select signal is output, refer to

Chapter 3, "Address Space."

Read

Output

This signal is output when reading an external device.

___ ___

BHW/BHE Byte high

Output

Indicates the byte position to which valid data is transferred

write/enable

___ ___

when writing to an external device. BHW/BHE corresponds

___ ___

BLW/BLE

Byte low

Output

___ ___

to the upper address (D0-D7 is valid); BLW/BLE

write/enable

corresponds to the lower address (D8-D15 is valid).

____

WAIT

Wait

Input

When the M32R accesses an external device, a low on this

____

WAIT input extends the wait cycle.

_____

HREQ

Hold request

Input

This pin is used by an external device to request control of

__________

the external bus. A low on this HREQ input causes the

M32R to enter a hold state.

__________

HACK

Hold

Output

This signal is used to notify that the M32R has entered a

acknowledge

hold state and relinquished control of the external bus.

Timer input

Input

Input pins for multijunction timer.

TO 0– TO 20 Timer output

Output

Output pins for the multijunction timer.

TCLK 0– TCLK 3 Timer clock

Input

Clock input pins for the multijunction timer.

A-D

AVCC0

Analog power supply

—

AVCC0 is the power supply for the A-D0 converter.

converter

Connect AVCC0 to the power supply rail (5 V or 3.3 V).

AVSS0

Analog ground

—

AVSS0 is analog ground for the A-D0 converter.

Connect AVSS0 to the ground.

OVERVIEW

1.3 Pin Function

Multi-

junction

timer

TIN 0,TIN 3

TIN 16–TIN 23

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