Int Interrupt - Renesas M16C/29 Series User Manual

M 1 6 C 2 / 9 G o r u p
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9.6 INT Interrupt

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INTi interrupt (i=0 to 5) is triggered by the edges of external inputs. The edge polarity is selected using the
IFSRi bit in the IFSR register.
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The INT5 input has an effective digital debounce function for a noise rejection. Refer to "19.6 Digital
Debounce function" for this detail. When using INT5 interrupt to exit stop mode, set the P17DDR register
to FF before entering stop mode.
16
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To use the INT4 interrupt, set the IFSR6 bit in the IFSR register to 1 (INT4). To use the INT5 interrupt, set
the IFSR7 bit in the IFSR register to 1 (INT5).
After modifiying bit IFSR6 or IFSR7, clear the corresponding IR bit to 0 (interrupt not requested) before
enabling the interrupt.
Figure 9.11 shows the IFSR registers.
Interrupt Request Cause Select Register
b7 b6 b5 b4 b3
NOTES:
1. When setting this bit to 1 (both edges), make sure the POL bit in registers INT0IC to INT5IC is set to
0 (falling edge).
2. When setting this bit to 0 (SI/O3, SI/O4), make sure the POL bit in registers S3IC and S4IC is set to
0 (falling edge).
Figure 9.11 IFSR Register
R e . v 1 1 . 2 M r a 3 . , 0 2 0 0 7
R E J 0 9 B 0 1 0 1 0 - 1 1 2
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b2 b1 b0
Symbol
IFSR
Bit Symbol
IFSR0 INT0 interrupt polarity
switching bit
IFSR1 INT1 interrupt polarity
switching bit
IFSR2 INT2 interrupt polarity
switching bit
IFSR3 INT3 interrupt polarity
switching bit
IFSR4 INT4 interrupt polarity
switching bit
IFSR5 INT5 interrupt polarity
switching bit
IFSR6 Interrupt request cause
select bit
IFSR7 Interrupt request cause
select bit
page 85
f o 4 5 8
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Address After Reset
035F 00
16
16
Bit Name
0 : One edge
1 : Both edges
0 : One edge
1 : Both edges
0 : One edge
1 : Both edges
0 : One edge
1 : Both edges
0 : One edge
1 : Both edges
0 : One edge
1 : Both edges
0 : SI/O3
1 : INT4
0 : SI/O4
1 : INT5
9. Interrupts
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Function
RW
RW
(1)
RW
(1)
RW
(1)
RW
(1)
RW
(1)
RW
(1)
(2)
RW
(2)
RW