ATSAM3308B datasheet(9/27 Pages) ATMEL

9 / 27 page

6090D–DRMSD–12-Feb-07

ATSAM3308B

WD15 –

WD0

94, 93, 92, 89, 88,

86, 85, 84, 80, 79,

78, 69, 68, 63, 62,

I/O

External memory data

P3.15 –

P3.0

94, 93, 92, 89, 88,

86, 85, 84, 80, 79,

78, 69, 68, 63, 62,

I/O

General-purpose I/O pins

WCS1

Out

External memory chip select 1, active low. Pre-decode for an external

RAM/Flash/ROM at address 200:0000H.

P1.10

I/O

General-purpose I/O pin

WCS0

Out

External memory chip select 2, active low. Pre-decode for an external

RAM/Flash/ROM at address 000:0000H

P1.9

I/O

General-purpose I/O pin

WOE

Out

External memory output enable, active low

P1.8

I/O

General-purpose I/O pin

WWE

Out

External memory write enable, active low

P1.7

I/O

General-purpose I/O pin

DFCS

Out

DataFlash chip select

DFSI

Out

DataFlash serial input (to DataFlash)

DFSO

DataFlash serial output (from DataFlash). This pin has a built-in pull-

down. It may be left open if not used.

DFSCK

Out

DataFlash data clock

P1.15

I/O

General-purpose I/O pin. This pin has built-in pull-up. It may be left

open if not used.

X1 – X2

72,71

External crystal connection. Standard frequencies are 6.9552 MHz, 9.6

MHz, 11.2896 MHz, 12.288 MHz. Max frequency is 12.5 MHz. An

external clock (max. 1.8 V

PP) can be connected to X1 using AC

coupling (22 pF). A built-in PLL multiplies the clock frequency by 4 for

internal use.

LFT

PLL decoupling RCR filter

RESET

Master reset Schmitt trigger input, active low. RESET should be held

low during at least 10 ms after power is applied. On the rising edge of

RESET, the chip enters an initialization routine, which may involve

firmware download from an external SmartMedia, DataFlash or host.

STIN

Serial test input. This is a 57.6 Kbaud asynchronous input used for

firmware debugging. This pin is tested at power-up. The built-in

debugger starts if STIN is found high. STIN has a built-in pull-down. It

should be grounded or left open for normal operation.

Table 6-1.

Pinout by Pin Name (Continued)

Pin Name

Pin Number

Type

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