Data Sheet

191
Atmel | SMART SAM D21 [DATASHEET]
Atmel-42181G–SAM-D21_Datasheet–09/2015
16.8.9 8MHz Internal Oscillator (OSC8M) Control
Name: OSC8M
Offset: 0x20
Reset: 0xXXXX0382
Property: Write-Protected
z Bits 31:30 – FRANGE[1:0]: Oscillator Frequency Range
These bits control the oscillator frequency range according to the table below. These bits are loaded from Flash
Calibration at startup.
Table 16-11. Oscillator Frequency Range
z Bits 29:28 – 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.
Bit 3130292827262524
FRANGE[1:0]
CALIB[11:8]
AccessR/WR/W R R R/WR/WR/WR/W
Reset X X 0 0 X X X X
Bit 2322212019181716
CALIB[7:0]
AccessR/WR/WR/WR/WR/WR/WR/WR/W
ResetXXXXXXXX
Bit 151413121110 9 8
PRESC[1:0]
AccessRRRRRRR/WR/W
Reset00000011
Bit 76543210
ONDEMAND RUNSTDBY ENABLE
AccessR/WR/WRRRRR/WR
Reset10000010
FRANGE[1:0] Description
0x0 4 to 6MHz
0x1 6 to 8MHz
0x2 8 to 11MHz
0x3 11 to 15MHz