Datasheet

1355
SAM4E [DATASHEET]
Atmel-11157D-ATARM-SAM4E16-SAM4E8-Datasheet_12-Jun-14
Figure 45-9. Optimized Temperature Conversion combined with classical conversions
If RTCT = 1, then if TRGEN is disabled and all channels are disabled (AFEC_CHSR = 0), then only channel 15 is
converted at a rate of 1 conversion per second.
This mode of operation, when combined with the sleep mode operation of the AFE Controller, provide s a low
power mode for temperature measure (assuming there is no other AFEC conversion to schedule at high sampling
rate or simply no other channel to convert).
Figure 45-10. Temperature Conversion Only
Moreover, it is possible to raise a flag only if there is predefined change in the temperature measure. The user can
define a range of temperature or a threshold in the AFEC_TEMPCWR and the mode of comparison that can be
Base Address (BA)
BA + 0x02
AFEC_CDR[0]0
BA + 0x04
AFEC_CDR[0]0
Assuming AFEC_CHSR[0] = 1 and A_CHSR[TEMP] = 1
where TEMP is the index of the temperature sensor channel
trig.event1
DMA Buffer Structure
trig.event2
DMA Transfer
trig.event3
Internal/External
Trigger event
AFEC_SEL
C
T
C
C
T
C
C: Classic AFE Conversion Sequence - T: Temperature Sensor Channel
C
AFEC_CHSR[TEMP] = 0, AFEC_MR.TRGEN = 1 and AFEC_TEMPMR.RTCT = 1
AFEC_CDR[0]0
Internal RTC
Trigger event
A
FEC_CDR[TEMP]
T1
T2T0
AFEC_CDR[0] &
AFEC_LCDR
C0 C1 C2 C3 C4 C5
1 s
AFEC_SEL
AFEC_CHSR = 0, AFE_MR.TRGEN = 0 and AFEC_TEMPMR.RTCT = 1
Internal RTC
Trigger event
1 s
Automatic “On”
Temp. sensor
T T
30 μs
on
off
A
FEC_CDR[TEMP]
T1
T2T0
AFEC_TEMPMR.RTCT = 1