Atmel Xplained Pro Evaluation Kit ATSAM4E-XPRO ATSAM4E-XPRO Data Sheet
Product codes
ATSAM4E-XPRO
SAM4E [DATASHEET]
Atmel-11157D-ATARM-SAM4E16-SAM4E8-Datasheet_12-Jun-14
610
30.17.10 PMC Master Clock Register
Name:
PMC_MCKR
Address:
0x400E0430
Access:
Read/Write
This register can only be written if the WPEN bit is cleared in
.
CSS: Master Clock Source Selection
PRES: Processor Clock Prescaler
PLLADIV2: PLLA Divisor by 2
31
30
29
28
27
26
25
24
–
–
–
–
–
–
–
–
23
22
21
20
19
18
17
16
–
–
–
–
–
–
–
–
15
14
13
12
11
10
9
8
–
–
–
PLLADIV2
–
–
–
–
7
6
5
4
3
2
1
0
–
PRES
–
–
CSS
Value
Name
Description
0
SLOW_CLK
Slow Clock is selected
1
MAIN_CLK
Main Clock is selected
2
PLLA_CLK
PLLA Clock is selected
Value
Name
Description
0
CLK_1
Selected clock
1
CLK_2
Selected clock divided by 2
2
CLK_4
Selected clock divided by 4
3
CLK_8
Selected clock divided by 8
4
CLK_16
Selected clock divided by 16
5
CLK_32
Selected clock divided by 32
6
CLK_64
Selected clock divided by 64
7
CLK_3
Selected clock divided by 3
PLLADIV2
PLLA Clock Division
0
PLLA clock frequency is divided by 1.
1
PLLA clock frequency is divided by 2.