Atmel Evaluation Kit AT91SAM9M10-G45-EK AT91SAM9M10-G45-EK Data Sheet
Product codes
AT91SAM9M10-G45-EK
355
SAM9M10 [DATASHEET]
6355F–ATARM–12-Mar-13
26.11.13 PMC Programmable Clock Register
Name:
PMC_PCKx
Address:
0xFFFFFC40
Access:
Read/Write
• CSS: Master Clock Selection
• PRES: Programmable Clock Prescaler
• SLCKMCK: Slow Clock or Master Clock Selection
0 = Slow clock is selected
1 = Master clock is selected
To select between Slow Clock and Master Clock, the CSS field must be programmed to ‘00’.
31
30
29
28
27
26
25
24
–
–
–
–
–
–
–
–
23
22
21
20
19
18
17
16
–
–
–
–
–
–
–
–
15
14
13
12
11
10
9
8
–
–
–
–
–
–
–
SLCKMCK
7
6
5
4
3
2
1
0
–
–
–
PRES
CSS
CSS
Clock Source Selection
0
0
Slow Clock or Master Clock may be selected depending on
SLCKMCK field.
SLCKMCK field.
0
1
Main Clock is selected.
1
0
PLLACK/PLLADIV2 is selected.
1
1
UPLLCK is selected.
PRES
Programmable Clock
0
0
0
Selected clock
0
0
1
Selected clock divided by 2
0
1
0
Selected clock divided by 4
0
1
1
Selected clock divided by 8
1
0
0
Selected clock divided by 16
1
0
1
Selected clock divided by 32
1
1
0
Selected clock divided by 64
1
1
1
Reserved