R8C11 datasheet(72/227 Pages) RENESAS

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R8C/11 Group

Rev.1.20

Jan 27, 2006

page 61 of 204

REJ09B0062-0120

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10.2.2 INT0 Input Filter

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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

INT0F1 to INT0F0 bits are set to “012”, “102”, or “112”, the P4_5 bit in the P4 register indicates the

filtered value.

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Figure 10.11 shows the INT0 input filter configuration. Figure 10.12 shows an operation example of

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INT0 input filter.

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Figure 10.11 INT0 Input Filter

Digital filter

(input level

matches 3x)

Port P45

direction

f32

INT0

INT0 interrupt

INT0EN

INT0F1 to INT0F0

=012

=102

=112

INT0F1 to INT0F0

=002

P4_5 bit

Other than

Sampling clock

INT0F0, INT0F1: Bits in INT0F register

INT0EN: Bit in INTEN register

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Figure 10.12 Operation Example of INT0 Input Filter

P45 input

Sampling

timing

P4_5 in

P4 register

IR bit in

INT0IC register

Set to “0” in program

This is an operation example when the INT0F1 to INT0F0 bits in the

INT0F register is set to “012”, “102”, or “112” (passing digital filter).

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10.2 INT Interrupt

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