32186 datasheet(29/1032 Pages) RENESAS

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OVERVIEW

1-11

32185/32186 Group Hardware Manual

Rev.1.10 REJ09B0235-0110 May 15, 07

Table 1.3.1 Description of Pin Functions (2/3)

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 “L” level input on

WAIT# pin extends the wait cycle.

HREQ#

Hold request

Input

This input pin is used by an external device to request

control of the external bus. A ”L” 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,

Timer input

Input

Input pins for the multijunction timer.

timer

TIN3–TIN11,

TIN16–TIN27,

TIN30–TIN33

TO0–TO36

Timer output

Output

Output pins for the multijunction timer.

TCLK0

Timer clock

Input

Clock input pins for the multijunction timer.

–TCLK3

A/D converter

AVCC0

Analog power

–

AVCC0 is the power supply input for the A/D0 converter.

supply input

Connect AVCC0 to the power supply rail.

AVSS0

Analog ground

–

AVSS0 is the analog ground for the A/D0 converter. Connect

AVSS0 to ground.

AD0IN0

Analog input

Input

16-channel analog input pins for the A/D0 converter.

–AD0IN15

VREF0

Reference voltage

Input

VREF0 is the reference voltage input pin for the A/D0

input

converter.

Interrupt

SBI#

System break

Input

This is the system break interrupt (SBI) input pin for the

controller

interrupt

interrupt controller.

Serial interface SCLKI0/

UART transmit/

Input/output

When channel is in UART mode:

SCLKO0,

receive clock output

This pin outputs a clock derived from BRG output by

SCLKI1/

or CSIO transmit/

dividing it by 2.

SCLKO1,

receive clock

When channel is in CSIO mode:

SCLKI4/

input/output

This pin inputs a transmit/receive clock when external

SCLKO4,

clock is selected or outputs a transmit/receive clock

SCLKI5/

when internal clock is selected.

SCLKO5

1.3 Pin Functions

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