Datasheet

16. Programmable I/O Ports
page 228
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Figure 16.6.2. Functioning of Digital Debounce Filter
f8
P85 / P17
Data Bus
1. (Condition after reset). Reload = FF, Port In = signal Out continuosly.
2. Reload = 03. At edge of Port In != Signal Out, Counter gets Reload Value and
stats counting down.
3. Port In = Signal Out, counting stops.
4. At edge of Port In != Signal Out, Counter gets Reload Value and starts counting.
5. Counter underflows, stops, and Port In is driven to Signal Out.
6. At edge of Port In != Signal Out, counter gets Reload Value and starts counting.
7. Counter underflows, stops, and Port In is driven to Signal Out.
8. At edge of Port In != Signal Out, counter gets Reload Value and starts counting.
9. FF is written to Reload Value. Counter is stopped and loaded with FF.
Port In = Signal Out continuously.
Clock
Port In
Reload Value
(write)
Digital Debounce Filter
Signal Out
Count Value
(read)
To NMI and SD / INT5 and INPC17
Data Bus
f
8
Reload Value
Port In
Signal Out
Count Value
Reload Value
(continued)
Port In
(continued)
Signal Out
(continued)
Count Value
(continued)
FF
03
FF
03
02 01
03
02 01
00
FF
03
FF
03
02
01
00
FF
FF
03
02
FF
1 2
3
4
5
6
7
8
9