Atmel Xplained Pro Evaluation Kit ATSAMD20-XPRO ATSAMD20-XPRO Hoja De Datos
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ATSAMD20-XPRO
116
Atmel | SMART SAM D20 [DATASHEET]
Atmel-42129K–SAM-D20_datasheet–06/2014
15.8.3 CPU Clock Select
Name:
CPUSEL
Offset:
0x08
Reset:
0x00
Property:
Write-Protected
z
Bits 7:3 – Reserved
These bits are unused and reserved for future use. For compatibility with future devices, always write these bits to
zero when this register is written. These bits will always return zero when read.
These bits are unused and reserved for future use. For compatibility with future devices, always write these bits to
zero when this register is written. These bits will always return zero when read.
z
Bits 2:0 – CPUDIV[2:0]: CPU Prescaler Selection
These bits define the division ratio of the main clock prescaler (2
These bits define the division ratio of the main clock prescaler (2
n
).
Bit
7
6
5
4
3
2
1
0
CPUDIV[2:0]
Access
R
R
R
R
R
R/W
R/W
R/W
Reset
0
0
0
0
0
0
0
0
Table 15-6. CPU Clock Frequency Ratio
CPUDIV[1:0]
Description
0x0
Divide by 1
0x1
Divide by 2
0x2
Divide by 4
0x3
Divide by 8
0x4
Divide by 16
0x5
Divide by 32
0x6
Divide by 64
0x7
Divide by 128