32182 datasheet(37/755 Pages) RENESAS

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1-10

OVERVIEW

32182 Group User’s Manual (Rev.1.0)

1.3 Pin Functions

Table 1.3.1 Description of Pin Functions (2/5)

Type

Pin Name

Signal Name

Input/Output Description

Data bus

DB0–DB15

Data bus

Input/output

This 16-bit data bus is used to connect external devices.

When writing in byte units during a write cycle, the output

data at the invalid byte position is undefined. During a

read cycle, data on the entire 16-bit bus is always read in.

However, only the data at the valid byte position is

transferred into the internal circuit.

Bus control

CS0#–CS3# Chip select

Output

These are chip select signals for external devices.

RD#

Read

Output

This signal is output when reading an external device.

WR#

Write

Output

This signal is output when writing to an external device.

BHW#/BLW# Byte high/low write

Output

When writing to an external device, this signal indicates the

valid byte position to which data is transferred. BHW# and

BLW# correspond to the upper address side (bits 0–7 are

valid) and the lower address side (bits 8–15 are valid),

respectively.

BHE#

Byte high enable

Output

During an external device access, this signal indicates that

the high-order data (bits 0–7) is valid.

BLE#

Byte low enable

Output

During an external device access, this signal indicates that

the low-order data (bits 8–15) is valid.

WAIT#

Wait

Input

When accessing an external device, a low-level input on

WAIT# pin extends the wait cycle.

HREQ#

Hold request

Input

This input is used by an external device to request control

of the external bus. A low-level input on HREQ# pin places

the CPU in a hold state.

HACK#

Hold acknowledge

Output

This signal notifies that the CPU has entered a hold state

and relinquished control of the external bus.

Multijunction

TIN0, TIN3,

Timer input

Input

Input pins for the multijunction timer.

timer

TIN16–TIN23

TO0–TO20

Timer output

Output

Output pins for the multijunction timer.

TCLK0

Timer clock

Input

Clock input pins for the multijunction timer.

–TCLK3

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