Datasheet

627
SAM3X / SAM3A [DATASHEET]
Atmel-11057C-ATARM-SAM3X-SAM3A-Datasheet_23-Mar-15
Figure 31-7. Event Detector on Input Lines (Figure represents line 0)
31.5.10.1 Example
If generating an interrupt is required on the following:
 Rising edge on PIO line 0
 Falling edge on PIO line 1
 Rising edge on PIO line 2
 Low Level on PIO line 3
 High Level on PIO line 4
 High Level on PIO line 5
 Falling edge on PIO line 6
 Rising edge on PIO line 7
 Any edge on the other lines
The configuration required is described below.
31.5.10.2 Interrupt Mode Configuration
All the interrupt sources are enabled by writing 32’hFFFF_FFFF in PIO_IER.
Then the Additional Interrupt Mode is enabled for line 0 to 7 by writing 32’h0000_00FF in PIO_AIMER.
31.5.10.3 Edge or Level Detection Configuration
Lines 3, 4 and 5 are configured in Level detection by writing 32’h0000_0038 in PIO_LSR.
The other lines are configured in Edge detection by default, if they have not been previously configured.
Otherwise, lines 0, 1, 2, 6 and 7 must be configured in Edge detection by writing 32’h0000_00C7 in PIO_ESR.
31.5.10.4 Falling/Rising Edge or Low/High Level Detection Configuration.
Lines 0, 2, 4, 5 and 7 are configured in Rising Edge or High Level detection by writing 32’h0000_00B5 in
PIO_REHLSR.
The other lines are configured in Falling Edge or Low Level detection by default, if they have not been previously
configured. Otherwise, lines 1, 3 and 6 must be configured in Falling Edge/Low Level detection by writing
32’h0000_004A in PIO_FELLSR.
Event Detector
0
1
0
1
1
0
0
1
Edge
Detector
Falling Edge
Detector
Rising Edge
Detector
PIO_FELLSR[0]
PIO_FRLHSR[0]
PIO_REHLSR[0]
Low Level
Detector
High Level
Detector
PIO_ESR[0]
PIO_ELSR[0]
PIO_LSR[0]
PIO_AIMDR[0]
PIO_AIMMR[0]
PIO_AIMER[0]
Event detection on line 0
Resynchronized input on line 0