AT91SAM9G20 Просмотр технического описания (PDF) - Atmel Corporation

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AT91SAM9G20

AT91 ARM Thumb Microcontrollers

Atmel Corporation 

Table 3-1. Signal Description List (Continued)

Signal Name

Function

NRST

TST

Microcontroller Reset

Test Mode Select

Reset/Test

Type

I/O

Input

BMS

DRXD

DTXD

IRQ0 - IRQ2

FIQ

PA0 - PA31

PB0 - PB31

PC0 - PC31

D0 - D31

A0 - A25

NWAIT

NCS0 - NCS7

NWR0 - NWR3

NRD

NWE

NBS0 - NBS3

CFCE1 - CFCE2

CFOE

CFWE

CFIOR

CFIOW

CFRNW

CFCS0 - CFCS1

Boot Mode Select

Input

Debug Unit - DBGU

Debug Receive Data

Input

Debug Transmit Data

Output

Advanced Interrupt Controller - AIC

External Interrupt Inputs

Input

Fast Interrupt Input

Input

PIO Controller - PIOA - PIOB - PIOC

Parallel IO Controller A

I/O

Parallel IO Controller B

I/O

Parallel IO Controller C

I/O

External Bus Interface - EBI

Data Bus

I/O

Address Bus

Output

External Wait Signal

Input

Static Memory Controller - SMC

Chip Select Lines

Output

Write Signal

Output

Read Signal

Output

Write Enable

Output

Byte Mask Signal

Output

CompactFlash Support

CompactFlash Chip Enable

Output

CompactFlash Output Enable

Output

CompactFlash Write Enable

Output

CompactFlash IO Read

Output

CompactFlash IO Write

Output

CompactFlash Read Not Write

Output

CompactFlash Chip Select Lines

Output

Active

Level

Comments

Low

Pull-up resistor

Pull-down resistor. Accepts

between 0V and VDDBU.

No pull-up resistor

BMS = 0 when tied to GND.

BMS = 1 when tied to VDDIOP.

Pulled-up input at reset

Pulled-up input at reset

Pulled-up input at reset

Pulled-up input at reset

0 at reset

Low

Low

Low

Low

Low

Low

Low

Low

Low

Low

Low

Low

6 AT91SAM9G20 Summary

6384CS–ATARM–11-Mar-09

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