SAM7X128_14 Datasheet, PDF (189/662 Pages) ATMEL Corporation – ARM-based Flash MCU

25.9.10 PMC Master Clock Register
Register Name:
PMC_MCKR
Access Type:
Read-write
31
30
29
28
–
–
–
–
23
22
21
20
–
–
–
–
15
14
13
12
–
–
–
–
7
6
5
4
–
–
–
• CSS: Master Clock Selection
CSS
0
0
1
1
• PRES: Processor Clock Prescaler
PRES
0
0
0
0
0
1
0
1
1
0
1
0
1
1
1
1
27
–
19
–
11
–
3
PRES
0
1
0
1
0
1
0
1
0
1
0
1
26
25
24
–
–
–
18
17
16
–
–
–
10
9
8
–
–
–
2
1
0
CSS
Clock Source Selection
Slow Clock is selected
Main Clock is selected
Reserved
PLL Clock is selected.
Processor 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
SAM7X Series [DATASHEET]
6120K–ATARM–11-Feb-14
189