Data Sheet

132
Atmel | SMART SAM D21 [DATASHEET]
Atmel-42181G–SAM-D21_Datasheet–09/2015
15.8.4 APBA Clock Select
Name: APBASEL
Offset: 0x09
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.
z Bits 2:0 – APBADIV[2:0]: APBA Prescaler Selection
These bits define the division ratio of the APBA clock prescaler (2
n
).
Table 15-8. APBA Prescaler Selection
Bit 76543210
APBADIV[2:0]
AccessRRRRRR/WR/WR/W
Reset00000000
APBADIV[2:0] Name Description
0x0 DIV1 Divide by 1
0x1 DIV2 Divide by 2
0x2 DIV4 Divide by 4
0x3 DIV8 Divide by 8
0x4 DIV16 Divide by 16
0x5 DIV32 Divide by 32
0x6 DIV64 Divide by 64
0x7 DIV128 Divide by 128