AT91 datasheet(3/153 Pages) ATMEL

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AT91X40 Series

1354D–ATARM–08/02

Table 1. AT91X40 Series Pin Description

Module

Name

Function

Type

Active

Level

Comments

EBI

A0 - A23

Address Bus

Output

–

All valid after reset

D0 - D15

Data Bus

I/O

–

NCS0 - NCS3

Chip Select

Output

Low

CS4 - CS7

Chip Select

Output

High

A23 - A20 after reset

NWR0

Lower Byte 0 Write Signal

Output

Low

Used in Byte Write option

NWR1

Upper Byte 1 Write Signal

Output

Low

Used in Byte Write option

NRD

Read Signal

Output

Low

Used in Byte Write option

NWE

Write Enable

Output

Low

Used in Byte Select option

NOE

Output Enable

Output

Low

Used in Byte Select option

NUB

Upper Byte Select

Output

Low

Used in Byte Select option

NLB

Lower Byte Select

Output

Low

Used in Byte Select option

NWAIT

Wait Input

Input

Low

BMS

Boot Mode Select

Input

–

Sampled during reset

AIC

FIQ

Fast Interrupt Request

Input

–

PIO-controlled after reset

IRQ0 - IRQ2

External Interrupt Request

Input

–

PIO-controlled after reset

TCLK0 - TCLK2

Timer External Clock

Input

–

PIO-controlled after reset

TIOA0 - TIOA2

Multipurpose Timer I/O Pin A

I/O

–

PIO-controlled after reset

TIOB0 - TIOB2

Multipurpose Timer I/O Pin B

I/O

–

PIO-controlled after reset

USART

SCK0 - SCK1

External Serial Clock

I/O

–

PIO-controlled after reset

TXD0 - TXD1

Transmit Data Output

Output

–

PIO-controlled after reset

RXD0 - RXD1

Receive Data Input

Input

–

PIO-controlled after reset

PIO

P0 - P31

Parallel IO Line

I/O

–

NWDOVF

Watchdog Overflow

Output

Low

Open-drain

Clock

MCKI

Master Clock Input

Input

–

Schmidt trigger

MCKO

Master Clock Output

Output

–

Reset

NRST

Hardware Reset Input

Input

Low

Schmidt trigger

NTRI

Tri-state Mode Select

Input

Low

Sampled during reset

ICE

TMS

Test Mode Select

Input

–

Schmidt trigger, internal pull-up

TDI

Test Data Input

Input

–

Schmidt trigger, internal pull-up

TDO

Test Data Output

Output

–

TCK

Test Clock

Input

–

Schmidt trigger, internal pull-up

Power

VDDIO

I/O Power

Power

–

VDDCORE

Core Power

Power

–

GND

Ground

–

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