Atmel SAM4S Series, Preliminary Data Sheet

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545
11100B–ATARM–31-Jul-12
SAM4S Series [Preliminary]
Figure 29-7. Event Detector on Input Lines (Figure represents line 0)
29.5.10.1 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.
29.5.10.2 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.
29.5.10.3 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 con-
figured. Otherwise, lines 0, 1, 2, 6 and 7 must be configured in Edge detection by writing
32’h0000_00C7 in PIO_ESR.
29.5.10.4 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.
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