Datasheet

61
32117D–AVR-01/12
AT32UC3C
7.7.2 CPU Clock Select
Name: CPUSEL
Access Type: Read/Write
Offset: 0x0004
Reset Value: 0x00000000
•
CPUDIV, CPUSEL: CPU Division and Clock Select
• CPUDIV = 0: CPU clock equals main clock.
• CPUDIV = 1: CPU clock equals main clock divided by 2
(CPUSEL+1)
.
Note that if CPUDIV is written to 0, CPUSEL should also be written to 0 to ensure correct operation.
Also note that writing this register clears SR:CKRDY. The register must not be re-written until CKRDY goes high.
Note that this register is protected by a lock. To write to this register the UNLOCK register has to be written first. Please
refer to the UNLOCK register description for details.
31 30 29 28 27 26 25 24
--------
23 22 21 20 19 18 17 16
--------
15 14 13 12 11 10 9 8
--------
76543210
CPUDIV - - - - CPUSEL