M30280F6HP RENESAS [Renesas Technology Corp], M30280F6HP Datasheet - Page 314

• Manufacturer Part Number: M30280F6HP
• Description: 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M16C/Tiny SERIES
• Manufacturer: RENESAS [Renesas Technology Corp]

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Figure 17.12 Digital Debounce Filter
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Example of INT5 Digital Debounce Function (if P17DDR = "03
1. (Condition after reset). P17DDR=FF
2. Set the P17DDR register to "03
3. The P17DDR register will stops counting when the pin input level and the signal output level are matched (e.g., both levels are "H") while
4. If the pin input level (e.g.,"L") and the signal output level (e.g.,"H") are not matched the P17DDR register will start decrement again after the
5. When the P17DDR register is underflow, it stops counting and the signal output will output the same as pin input level (e.g."L").
6. If the pin input level (e.g.,"H") and the signal output level (e.g., "L") are not matched again, the P17DDR register will start decrement again
7. When the P17DDR register is underflow, it stops counting and the signal output will output the same as pin input level (e.g."H").
8. If the pin input level (e.g.,"H") and the signal output level (e.g., "L") are not matched again, the P17DDR register will start decrement again
9. Set the P17DDR register to "FF
f
Reload Value
Port In
Signal Out
Count Value
Reload Value
Port In
Signal Out
Count Value
8
0
0
8
Data Bus
(continued)
(continued)
(continued)
(continued)
and the signal output level (e.g.,"H") are not matched.
counting.
setting value is reloaded.
after the setting value is reloaded.
after the setting value is reloaded.
directly.
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Clock
Port In
Reload Value
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FF
Digital Debounce Filter
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(write)
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FF
03
FF
page 294
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03
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16
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". The P17DDR register starts decrement along the f8 as a counter source, if the pin input level (e.g.,"L")
". The P17DDR register starts counting after the setting value is reloaded. Pin input signal will be output
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f o
. Pin input signal will be output directly.
8
3
Count Value
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8
Signal Out
01
5
03
2
(read)
03
00
7
02
16
FF
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To INT5
Data Bus
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3
8
03
02
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9
03
FF
FF
02
01
00
17. Programmable I/O Ports
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FF