ATSAM4S-EK Datasheet, PDF (11/49 Pages) ATMEL Corporation – Development Board

Evaluation Kit Hardware
The SAM4S features an External Bus Interface (EBI) that permits interfacing to a broad range of external
memories and virtually to any parallel peripheral. The SAM4S-EK board is equipped with a memory
device connected to the SAM4 EBI:
„ One NAND Flash MT29F2G08ABAEA.
Figure 4-2.
NAND Flash
+3V3 +3V3
R15
R16
47K
47K
PC17
PC16
PC9
PC10
PC14
JP9
Header2
PC18 R19
0R
+3V3
R21
47K
R22
0R nm
DGND
NAND FLASH
MN3
MT29F2G08ABAEA
16
17
8
18
CLE
ALE
RE
WE
9
CE
7
19
R/B
WP
1
2
3
4
5
N.C1
N.C2
N.C3
N.C4
6
10
11
14
15
20
21
22
23
N.C5
N.C6
N.C7
N.C8
N.C9
N.C10
N.C11
N.C12
N.C13
24 ^N.C14
25
26
N.C15
N.C16
N.C17
I/O0
I/O1
I/O2
I/O3
I/O4
29
30
31
32
41
42
I/O5 ₄₃
I/O6
I/O7
44
N.C28
N.C27
N.C26
N.C25
N.C24
N.C23
48
47
46
45
40
39
38
PRE
N.C22
N.C21
N.C20
N.C19
N.C18
35
34
33
28
27
VCC
VCC
37
12
VSS
VSS
36
13
PC0
PC1
PC2
PC3
PC4
PC5
PC6
PC7
+3V3
C27
C28
C29
100nF 100nF 1uF
DGND
NCS0 chip select signal is used for NAND Flash chip selection. Furthermore, a dedicated jumper (JP9)
can disconnect it from the on-board memories, thereby letting NCS0 free for other custom purpose.
4.3.3
Clock Circuitry
The clock generator of a SAM4S 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 (default
value), 8 or 12 MHz.
„ A 60 to 130 MHz PLL (PLLB) providing a clock for the USB Full Speed Controller.
„ A 60 to 130 MHz programmable PLL (PLLA), capable to provide the clock MCK to the processor and
to the peripherals. The input frequency of PLLA is from 7.5 and 20 MHz.
The SAM4S-EK board is equipped with one 12 MHz crystal, optional Piezoelectric Ceramic Resonator
12 Mhz (Murata ref. CSTCE12M0G15L99-R0), one 32.768 Hz crystal and an external clock input con-
nector (optional, not populated by default).
Figure 4-3. External Clock Source
NOT POPULATED
J1
1
2
3
4
5
R1
DNP
R2
49.9R 1%
R3
DGND
DGND
3
Y1
DNP
DGND
R7
DNP
C1 20pF
R4
0R
XIN
Y2 12MHz
PB9 R6
DNP
DGND
R5
0R
C2 20pF
XOUT
DNP
PB8 R8
DNP
C3
20pF
R11
0R
XIN32
97
PB9_XIN
MN1
SAM4S
DGND
3
C4
20pF
Y3
32.768KHz
R12
0R
XOUT32
96
PB8_XOUT
49
PA7_RTS0_PWMH3 ₄₈
PA8_CTS0_AD12BTRG
XIN32 R9
XOUT32 R10
DNP PA7
DNP PA8
SAM4S-EK Development Board User Guide
4-3
11139A–ATARM–29-Nov-11