AT91SAM9G45_1 Datasheet, PDF (367/1159 Pages) ATMEL Corporation – AT91 ARM Thumb-based Microcontrollers

AT91SAM9G45
26.11.13 PMC Programmable Clock Register
Register Name:PMC_PCKx
Address: 0xFFFFFC40
Access Type:Read/Write
31
30
29
28
27
26
–
–
–
–
–
–
23
22
21
20
19
18
–
–
–
–
–
–
15
14
13
12
11
10
–
–
–
–
–
–
7
6
5
4
3
2
–
–
–
PRES
• CSS: Master Clock Selection
25
24
–
–
17
16
–
–
9
8
–
SLCKMCK
1
0
CSS
CSS
0
0
0
1
1
0
1
1
• PRES: Programmable Clock Prescaler
Clock Source Selection
Slow Clock is selected.
Main Clock is selected.
PLLACK/PLLADIV2 is selected.
UPLLCK is selected.
PRES
0
0
0
0
0
1
0
1
0
0
1
1
1
0
0
1
0
1
1
1
0
1
1
1
• SLCKMCK: Slow Clock or Master Clock Selection
0 = Slow clock is selected
1 = Master clock is selected
If CSS field is not programmed to ‘00’ no Output clock will be provided.
Programmable Clock
Selected clock
Selected clock divided by 2
Selected clock divided by 4
Selected clock divided by 8
Selected clock divided by 16
Selected clock divided by 32
Selected clock divided by 64
Reserved
6438D–ATARM–13-Oct-09
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