AT91SAM9G20 datasheet(6/832 Pages) ATMEL

6 / 832 page

6384D–ATARM–04-May-09

AT91SAM9G20 Preliminary

Reset/Test

NRST

Microcontroller Reset

I/O

Low

Pull-up resistor

TST

Test Mode Select

Input

Pull-down resistor. Accepts

between 0V and VDDBU.

BMS

Boot Mode Select

Input

No pull-up resistor

BMS = 0 when tied to GND.

BMS = 1 when tied to VDDIOP.

Debug Unit - DBGU

DRXD

Debug Receive Data

Input

DTXD

Debug Transmit Data

Output

Advanced Interrupt Controller - AIC

IRQ0 - IRQ2

External Interrupt Inputs

Input

FIQ

Fast Interrupt Input

Input

PIO Controller - PIOA - PIOB - PIOC

PA0 - PA31

Parallel IO Controller A

I/O

Pulled-up input at reset

PB0 - PB31

Parallel IO Controller B

I/O

Pulled-up input at reset

PC0 - PC31

Parallel IO Controller C

I/O

Pulled-up input at reset

External Bus Interface - EBI

D0 - D31

Data Bus

I/O

Pulled-up input at reset

A0 - A25

Address Bus

Output

0 at reset

NWAIT

External Wait Signal

Input

Low

Static Memory Controller - SMC

NCS0 - NCS7

Chip Select Lines

Output

Low

NWR0 - NWR3

Write Signal

Output

Low

NRD

Read Signal

Output

Low

NWE

Write Enable

Output

Low

NBS0 - NBS3

Byte Mask Signal

Output

Low

CompactFlash Support

CFCE1 - CFCE2

CompactFlash Chip Enable

Output

Low

CFOE

CompactFlash Output Enable

Output

Low

CFWE

CompactFlash Write Enable

Output

Low

CFIOR

CompactFlash IO Read

Output

Low

CFIOW

CompactFlash IO Write

Output

Low

CFRNW

CompactFlash Read Not Write

Output

CFCS0 - CFCS1

CompactFlash Chip Select Lines

Output

Low

Table 3-1.

Signal Description List (Continued)

Signal Name

Function

Type

Active

Level

Comments

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