R5F21133DFP RENESAS [Renesas Technology Corp], R5F21133DFP Datasheet - Page 72

• Manufacturer Part Number: R5F21133DFP
• Description: 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY/R8C/Tiny SERIES
• Manufacturer: RENESAS [Renesas Technology Corp]

R8C/13 Group
Rev.1.20
REJ09B0111-0120
Figure 10.12 Operation Example of INT0 Input Filter
Figure 10.11 INT0 Input Filter
Sampling
timing
P45 input
P4_5 in
P4 register
IR bit in
INT0IC register
10.2.2 INT0 Input Filter
This is an operation example when the INT0F1 to INT0F0 bits in the
INT0F register is set to “01
The INT0 input has a digital filter which can be sampled by one of three sampling clocks. The sampling
clock is selected using the INT0F1 to INT0F0 bits in the INT0F register. The IR bit in the INT0IC
register is set to “1” (interrupt requested) when the sampled input level matches three times. When the
INT0F1 to INT0F0 bits are set to “01
filtered value.
Figure 10.11 shows the INT0 input filter configuration. Figure 10.12 shows an operation example of
INT0 input filter.
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Jan 27, 2006
Port P45
direction
INT0F0, INT0F1: Bits in INT0F register
INT0EN: Bit in INTEN register
register
_______
_______
INT0
______
f
f
f
1
8
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INT0F1 to INT0F0
2
”, “10
=11
=01
=10
2
2
2
”, or “11
2
_____
2
” (passing digital filter).
______
Sampling clock
matches 3x)
Digital filter
(input level
2
”, “10
2
”, or “11
Other than
INT0F1 to INT0F0
INT0EN
=00
=00
2
2
”, the P4_5 bit in the P4 register indicates the
2
Set to “0” in program
INT0 interrupt
P4_5 bit
10.2 INT Interrupt
______