Datasheet

117
42023E–SAM–07/2013
ATSAM4L8/L4/L2
10.7.2 CPU Clock Select
Name: CPUSEL
Access Type: Read/Write
Offset: 0x004
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. Refer to
Section 10.7.7 ”PM Unlock Register” on page 123 for details.
31 30 29 28 27 26 25 24
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23 22 21 20 19 18 17 16
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15 14 13 12 11 10 9 8
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76543210
CPUDIV - - - - CPUSEL