Datasheet

980
SAM9X25 [DATASHEET]
11054E–ATARM–10-Mar-2014
42.7.17 ADC Trigger Register
Name: ADC_TRGR
Address: 0xF804C0C0
Access: Read-write
• TRGMOD: Trigger Mode
• TRGPER: Trigger Period
Effective only if TRGMOD defines a Periodic Trigger.
Defines the periodic trigger period, with the following equation:
Trigger Period = (TRGPER+1) /ADCCLK
The minimum time between 2 consecutive trigger events must be strictly greater than the duration time of the longest conversion
sequence according to configuration of registers ADC_MR, ADC_CHSR, ADC_SEQR1, ADC_SEQR2 .
31 30 29 28 27 26 25 24
TRGPER
23 22 21 20 19 18 17 16
TRGPER
15 14 13 12 11 10 9 8
––––––––
76543210
–––––
TRGMOD
Value Name Description
0 NO_TRIGGER No trigger, only software trigger can start conversions
1 EXT_TRIG_RISE External Trigger Rising Edge
2 EXT_TRIG_FALL External Trigger Falling Edge
3EXT_TRIG_ANYExternal Trigger Any Edge
4–Reserved
5 PERIOD_TRIG Periodic Trigger (TRGPER shall be initiated appropriately)
6 CONTINUOUS Continuous Mode
7–Reserved