Atmel Xplained Pro Evaluation Kit for the ATSAMD21J18A Microcontroller ATSAMD21-XPRO ATSAMD21-XPRO Data Sheet
Product codes
ATSAMD21-XPRO
171
Atmel | SMART SAM D21 [DATASHEET]
Atmel-42181C–SAM-D21_Datasheet–07/2014
16.8.5 External Multipurpose Crystal Oscillator (XOSC) Control
Name:
XOSC
Offset:
0x10
Reset:
0x0080
Property:
Write-Protected
z
Bits 15:12 – STARTUP[3:0]: Start-Up Time
These bits select start-up time for the oscillator according to the table below.
The OSCULP32K oscillator is used to clock the start-up counter.
These bits select start-up time for the oscillator according to the table below.
The OSCULP32K oscillator is used to clock the start-up counter.
Bit
15
14
13
12
11
10
9
8
STARTUP[3:0]
AMPGC
GAIN[2:0]
Access
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Reset
0
0
0
0
0
0
0
0
Bit
7
6
5
4
3
2
1
0
ONDEMAND
RUNSTDBY
XTALEN
ENABLE
Access
R/W
R/W
R
R
R
R/W
R/W
R
Reset
1
0
0
0
0
0
0
0
Table 16-7. Start-UpTime for External Multipurpose Crystal Oscillator
STARTUP[3:0]
Number of
OSCULP32K Clock
Cycles
OSCULP32K Clock
Cycles
Number of XOSC
Clock Cycles
Clock Cycles
Approximate Equivalent Time
0x0
1
3
31µs
0x1
2
3
61µs
0x2
4
3
122µs
0x3
8
3
244µs
0x4
16
3
488µs
0x5
32
3
977µs