SAM3X8E Atmel Corporation, SAM3X8E Datasheet - Page 567
SAM3X8E
Manufacturer Part Number
SAM3X8E
Description
Manufacturer
Atmel Corporation
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28.2.15.11
Name:
Address:
Access:
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
11057A–ATARM–17-Feb-12
11057A–ATARM–17-Feb-12
PLLADIV2
31
23
15
–
–
–
7
–
Value
Value
0
1
2
3
0
1
2
3
4
5
6
7
0
1
PMC Master Clock Register
PMC_MCKR
0x400E0630
Read-write
Name
SLOW_CLK
MAIN_CLK
PLLA_CLK
UPLL_CLK
Name
CLK
CLK_2
CLK_4
CLK_8
CLK_16
CLK_32
CLK_64
CLK_3
PLLA Clock Division
PLLA clock frequency is divided by 1.
PLLA clock frequency is divided by 2.
30
22
14
–
–
–
6
UPLLDIV2
PRES
29
21
13
–
–
5
Description
Main Clock is selected
PLLA Clock is selected
Slow Clock is selected
UPLL Clock is selected
Description
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
Selected clock divided by 3
PLLADIV2
28
20
12
–
–
4
“PMC Write Protect Mode Register”
27
19
11
–
–
–
3
–
26
18
10
–
–
–
–
2
.
25
17
–
–
–
9
1
SAM3X/A
SAM3X/A
CSS
24
16
–
–
–
8
0
567
567
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