Atmel ATSAM3U-EK Hoja De Datos

Evaluation Kit Hardware

4-4

SAM3U-EK Evaluation Kit User Guide

6478E–ATARM–30-Mar-11

Figure 4-3.

NAND Flash

The chip select signals NCS0 and NCS1 are used for PSRAM and NAND Flash chips selection, respec-
tively. Furthermore, a dedicated jumper can disconnect these from the memories, to let NCS0 and NCS1
be used for other custom purpose.

4.3.3

Clock Circuitry

The clock generator of a SAM3U4E microcontroller is made up of:

A Low Power 32,768 Hz Slow Clock Oscillator with bypass mode

A 3 to 20 MHz Crystal Oscillator, which can be bypassed (12 MHz needed in case of USB)

A factory programmed fast internal RC Oscillator. 3 output frequencies can be selected: 4, 8 or
12 MHz (default value is 4 MHz).

A 480 MHz UTMI PLL providing a clock for the USB High Speed Device Controller

A 96 to 192 MHz programmable PLL (input from 8 to 16 MHz), capable of providing the clock MCK to
the processor and to the peripherals.

The SAM3U-EK board is equipped with one 12 MHz crystal, one 32,768 Hz crystal and an external clock
input connector (optional, not populated by default).

P B 21

P B 22

P B 18

P B 17

P B 24

P B 6
P B 31
P B 30
P B 16
P B 15
P B 14
P B 13
P B 29

P B 28
P B 12
P B 11
P B 10
P B 9
P B 27
P B 26
P B 25

P C 12

+3V 3

DG ND

+3V 3

DG ND

+3V 3

P B [31:0]

P C [31:0]

NANDRDY
NANDOE

NANDCL E
NANDAL E
NANDWE

NCS 1

R 18
DNP

C 30
100nF

C 33
100nF

C 31
100nF

R 17

47K

R 17

47K

R 13
47K

R 12
47K

C 32
100nF

R 14

J P 13
J P

MN3
MT 29F 2G 16AADW P

NC 1

NC 2

NC 3

NC 4

NC 5

NC 6

R /B #

R E #

C E #

NC 7

NC 8

V C C 1

V S S 1

NC 9

NC 10

C LE

ALE

W E #

W P #

NC 11

NC 12

NC 13

NC 14

NC 15

V S S 2

IO8

IO9

IO10

IO0

IO1

IO2

IO3

IO11

V C C 2

NC 16

V S S 3

V C C 3

NC 17

V C C 4

IO12

IO4

IO5

IO6

IO7

IO13

IO14

IO15

V S S 4