at32uc3b0512-z2ues ATMEL Corporation, at32uc3b0512-z2ues Datasheet - Page 51
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at32uc3b0512-z2ues
Manufacturer Part Number
at32uc3b0512-z2ues
Description
32-bit Avr Microcontroller
Manufacturer
ATMEL Corporation
Datasheet
1.AT32UC3B0512-Z2UES.pdf
(680 pages)
- Current page: 51 of 680
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9.6.2
Name:
Access Type:
Offset:
Reset Value:
•
•
•
•
32059J–12/2010
PBBDIV, PBBSEL: PBB Division and Clock Select
PBADIV, PBASEL: PBA Division and Clock Select
HSBDIV, HSBSEL: HSB Division and Clock Select
CPUDIV, CPUSEL: CPU Division and Clock Select
CPUDIV
PBBDIV
PBADIV
HSBDIV
31
23
15
7
PBBDIV = 0: PBB clock equals main clock.
PBBDIV = 1: PBB clock equals main clock divided by 2
PBADIV = 0: PBA clock equals main clock.
PBADIV = 1: PBA clock equals main clock divided by 2
For the
CPUDIV = 0: CPU clock equals main clock.
CPUDIV = 1: CPU clock equals main clock divided by 2
Note that if xxxDIV is written to 0, xxxSEL should also be written to 0 to ensure correct operation.
Also note that writing this register clears POSCSR:CKRDY. The register must not be re-written until CKRDY goes high.
to the CPU clock.
Clock Select Register
AT32UC3B
30
22
14
6
-
-
-
-
CKSEL
Read/Write
0x004
0x00000000
, HSBDIV always equals CPUDIV, and HSBSEL always equals CPUSEL, as the HSB clock is always equal
29
21
13
5
-
-
-
-
28
20
12
4
-
-
-
-
(PBBSEL+1)
(PBASEL+1)
(CPUSEL+1)
.
.
27
19
11
.
3
-
-
-
-
26
18
10
2
HSBSEL
CPUSEL
PBBSEL
PBASEL
25
17
9
1
AT32UC3B
24
16
8
0
51
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