M16CSLASH29 datasheet(109/499 Pages) RENESAS

109 / 499 page

9. Interrupts

page 85

Interrupt Request Cause Select Register

Bit Name

Function

Bit Symbol

Symbol

Address

After Reset

IFSR

035F16

0016

IFSR0

b7 b6 b5 b4 b3 b2 b1 b0

INT0 interrupt polarity

switching bit

0 : SI/O3

1 : INT4

0 : SI/O4

1 : INT5

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

INT1 interrupt polarity

switching bit

INT2 interrupt polarity

switching bit

INT3 interrupt polarity

switching bit

INT4 interrupt polarity

switching bit

INT5 interrupt polarity

switching bit

0 : One edge

1 : Both edges

Interrupt request cause

select bit

Interrupt request cause

select bit

IFSR1

IFSR2

IFSR3

IFSR4

IFSR5

IFSR6

IFSR7

(1)

(2)

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).

(2)

______

9.6 INT Interrupt

_______

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.

________

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 FF16 before entering stop mode.

________

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.

Figure 9.11 IFSR Register

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