Datasheet

29.8.6 32KHz External Crystal Oscillator (XOSC32K) Control
Name: XOSC32K
Offset: 0x14
Reset: 0x2080
Property: PAC Write-Protection
Bit 15 14 13 12 11 10 9 8
CGM[1:0] WRTLOCK STARTUP[2:0]
Access
R/W R/W R/W R/W R/W R/W
Reset 0 1 0 0 0 0
Bit 7 6 5 4 3 2 1 0
ONDEMAND RUNSTDBY EN1K EN32K XTALEN ENABLE
Access
R/W R/W R/W R/W R/W R/W
Reset 1 0 0 0 0 0
Bits 14:13 – CGM[1:0] Control Gain Mode
These bits control the gain of the external crystal oscillator.
Value Name Description
0x1
XT Standard mode
0x2
HS High Speed mode
Bit 12 – WRTLOCK Write Lock
This bit locks the XOSC32K register for future writes, effectively freezing the XOSC32K configuration.
Value Description
0
The XOSC32K configuration is not locked.
1
The XOSC32K configuration is locked.
Bits 10:8 – STARTUP[2:0] Oscillator Start-Up Time
These bits select the start-up time for the oscillator.
The OSCULP32K oscillator is used to clock the start-up counter.
Table 29-2. Start-Up Time for 32KHz External Crystal Oscillator
STARTUP[2:0] Number of OSCULP32K
Clock Cycles
Number of XOSC32K
Clock Cycles
Approximate Equivalent
Time
[ms]
0x0 2048 3 62.592
0x1 4096 3 125.092
0x2 16384 3 500.092
0x3 32768 3 1000.0092
0x4 65536 3 2000.0092
0x5 131072 3 4000.0092
0x6 262144 3 8000.0092
0x7 - - Reserved
SAM D5x/E5x Family Data Sheet
OSC32KCTRL – 32KHz Oscillators Controller
© 2019 Microchip Technology Inc.
Datasheet
DS60001507E-page 826