12 pmc master clock register, 13 pmc programmable clock register – Rainbow Electronics AT91CAP9S250A User Manual
Page 376
376
6264A–CAP–21-May-07
AT91CAP9S500A/AT91CAP9S250A
29.9.12
PMC Master Clock Register
Register Name:
PMC_MCKR
Access Type:
Read/Write
• CSS: Master Clock Selection
• PRES: Processor Clock Prescaler
• MDIV: Master Clock Division
29.9.13
PMC Programmable Clock Register
Register Name:
PMC_PCKx
31
30
29
28
27
26
25
24
–
–
–
–
–
–
–
–
23
22
21
20
19
18
17
16
–
–
–
–
–
–
–
–
15
14
13
12
11
10
9
8
–
–
–
–
–
–
MDIV
7
6
5
4
3
2
1
0
–
–
–
PRES
CSS
CSS
Clock Source Selection
0
0
Slow Clock is selected
0
1
Main Clock is selected
1
0
PLL A Clock is selected
1
1
PLL B Clock is selected
PRES
Processor 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
MDIV
Master Clock Division
0
0
Master Clock is Processor Clock.
0
1
Master Clock is Processor Clock divided by 2.
1
0
Master Clock is Processor Clock divided by 4.
1
1
Reserved.