20 NMI
GCLK
NMI.GLCK: If NMI is configured in synchronous edge detection mode (NMICTR.NMISENSE = 1, 2, or 3; NMICTRL.NMIASYNCH = 0), spurious NMI interrupts may occur after a software reset (CTRLA.SWRST = 1).
Workaround
- Configure one dummy EIC External Interrupt x (EXTINTx) in edge detection mode
- Enable EIC: CTRLA.ENABLE = 1
- Wait for synchronization completion (SYNCBUSY.ENABLE = 0)
- Configure the NMI in edge detection mode
Affected Silicon Revisions
| A1 | A2 | ||||
|---|---|---|---|---|---|
| X | X |