32172 datasheet(33/875 Pages) RENESAS

33 / 875 page

1-12

Rev.1.0

Table 1.3.1 Description of Pin Functions (1/6)

Classification Pin Name

Description

Type

Function

Power supply

VCCE

Power supply

––

Supplies power to external I/O ports (5 V).

VCCI

Power supply

––

Supplies power to the internal logic (3.3 V).

VDD

RAM power supply

––

Power supply pin for internal RAM backup (3.3 V).

FVCC

Flash power supply ––

Power supply pin for the internal flash memory (3.3 V).

VSS

Ground

––

Connect all VSS to ground (GND).

Clock

XIN,

Clock

Input

Clock input/output pin. With a PLL-based

XOUT

Output

frequency multiplier circuit included, enter a clock with

1/4 the operating frequency (XIN input = 10.0 MHz for

the CPU clock of 40 MHz).

Use this clock for external synchronized design.

______

BCLK/WR

System

Output

When this signal is System Clock (BCLK), it outputs a

clock

clock whose is twice that of extemal inpout clock.

(BCLK output = 20 MHz when CPU clock operates at

40 MHz).

When this signal is Write (WR), during extemal write

access it indicates the valid data on the data bus to

transfer.

input clock (BCLK output = 20 MHz when the external

input clock is 10 MHz).

OSC-VCC

Power supply

––

Power supply for the PLL circuit. Connect OSC-VCC to

the power supply (3.3 V).

OSC-VSS

Ground

––

Connect OSC-VSS to ground.

VCNT

PLL control

Input

PLL circuit control pin. Connect a resistor and capacitor

to this pin. (For details about an external circuit, refer to

Section 20.1.1, "Example of an Oscillator Circuit."

Reset

_____

RESET

Reset

Input

Resets the internal circuits.

Mode

MOD0

Mode

Input

Sets operation mode.

MOD1

MOD0

MOD1

Mode

Single-chip mode

External extended mode

Processor mode

Boot mode

(Reserved)

Address

A12-A30

Address

Output

To allow four blocks of up to 1 MB memory space to

bus

be connected external to the chip, 19 address lines

(A12-A30) are provided. A31 is not output to the

outside.

Note: For details about boot mode, refer to Chapter 6, "Internal Memory."

Overview

1.3 Pin Functions

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