ATSAM4S-WPIR-RD Atmel, ATSAM4S-WPIR-RD Datasheet - Page 12

• Manufacturer Part Number: ATSAM4S-WPIR-RD
• Description: Development Boards & Kits - ARM SAM4S16 W.PIR CAMERA REF. DESIGN
• Manufacturer: Atmel

Specifications of ATSAM4S-WPIR-RD

• Rohs: yes
• Product: Reference Designs
• Tool Is For Evaluation Of: ATSAM3S4BA
• Core: ARM Cortex M3
• Interface Type: JTAG, USB
• Operating Supply Voltage: 5 V
• Data Bus Width: 32 bit
• For Use With: RF231USB-RD

4.3.2
All clock sources are controlled and may be monitored by the Power Management Controller (PMC) which distributes
the clock to all internal functional units.
Figure 4-4. General clock block diagram.
Microcontroller clock
The RF231USB-RD is populated with an external 18.432MHz crystal oscillator, Q1, assembled on the top side of the
printed circuit board close to the MCU. Connected to XIN/XOUT (pins 61 and 62) it delivers an accurate clock for the
ATSAM3S4BA.
Since the design is a USB device, low power modes are not expected (“always on”). Therefore no external 32.768kHz
crystal is provided.
Figure 4-5. 18.432MHz crystal connection.
X O U T 3 2 / P A 8
GND
X O U T / P B 8
X I N 3 2 / P A 7
X I N / P B 9
22pF
( S u p p ly C o n t r o ll e r )
C17
X T A L S E L
1
18.432MHz / CL=16pF
GND GND
Q1
3
C l o c k G e n e r a t o r
R C O s c illa t o r
4 / 8 / 1 2 M H z
M a n a g e m e n t
GND
E m b e d d e d
3 2 k H z R C
E m b e d d e d
R e s o n a t o r
3 2 7 6 8 H z
3 - 2 0 M H z
O s c ill a t o r
O s c ill a t o r
O s c ill a t o r
S t a t u s
C e r a m ic
C o n t r o ll e r
C r y s t a l
C r y s t a l
F a s t
P o w e r
22pF
C18
o r
Atmel AVR2030: ATRF231USB – Hardware User Manual [APPLICATION NOTE]
C o n t r o l
0 1 0 1
M O S C S E L
P L L B a n d
P L L A a n d
D iv id e r / 2
62
61
P L L B D I V 2
P L L A D I V 2
D iv id e r / 2
PB9/XIN
PB8/XOUT
P L L A C l o c k
P L L A C K
P L L B C lo c k
P L L B C K
M a in C l o c k
M A I N C K
S l o w C lo c k
S L C K
S L C K
M A I N C K
P L L B C K
P L L A C K
M a s t e r C l o c k C o n t r o l le r
P L L A C K
P L L B C K
( P M C _ M C K R )
M A I N C K
P L L B C K
P L L A C K
S L C K
/ 1 , / 2 , / 3 , / 4 , / 8 ,
/ 1 6 , / 3 2 , / 6 4
P r e s c a l e r
P R E S
U S B C l o c k C o n t r o lle r ( P M C _ U S B )
P r o g r a m m a b le C l o c k C o n t r o l le r
( P M C _ P C K x )
/ 1 , / 2 , / 4 , / 8 ,
/ 1 6 , / 3 2 , / 6 4
P r e s c a le r
/ 1 , / 2 , / 3 , . . . , / 1 6
P R E S
D iv i d e r
U S B D I V
P e r ip h e r a ls
C lo c k C o n t r o lle r
( P M C _ P C E R x )
S le e p M o d e
P r o c e s s o r
C o n t r o lle r
O N / O F F
D iv i d e r
C lo c k
/ 8
42018A−AVR−08/2012
O N / O F F
F r e e r u n n i n g c lo c k
P r o c e s s o r c lo c k
M a s t e r c lo c k
U S B C lo c k
M C K
H C L K
in t
S y s T ic k
F C L K
p e r ip h _ c lk [ . .
p c k [ . . ]
U D P C K
c
12