M16CSLASH26 datasheet(65/239 Pages) RENESAS

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Interrupts

Renesas Technology Corp.

M16C/26 Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

Under

development

Preliminary Specifications Rev. 0.9

Specifications in this manual are tentative and subject to change.

INT Interrupt

INT0, INT1, INT3 to INT5 are triggered by the edges of external inputs. The edge polarity of the interrupt is

selected using the polarity select bit in the interrupt control registers, 004416, 004816, 004916, 005D16 and

005E16.

To generate interrupts on both rising and falling edges, set the INTi interrupt polarity switching bit of the

interrupt request cause select register (035F16) to "1". Interrupt on both rising and falling edges will be

generated regardless of the value set in the polarity select bit of the corresponding interrupt control regis-

ter.

Figure 1.9.10 shows the Interrupt request cause select register.

Figure 1.9.10. Interrupt request cause select register

Interrupt request cause select register

Bit name

Function

Bit symbol

Symbol

Address

When reset

IFSR

035F16

0016

IFSR0

INT0 interrupt polarity

switching bit

0 : Reserved

1 : INT4 (note)

0 : Reserved

1 : INT5 (note)

0 : One edge

1 : Two edges

0 : One edge

1 : Two edges

0 : One edge

1 : Two edges

0 : One edge

1 : Two edges

INT1 interrupt polarity

switching bit

Reserved

INT3 interrupt polarity

switching bit

INT4 interrupt polarity

switching bit

INT5 interrupt polarity

switching bit

0 : One edge

1 : Two edges

Interrupt request cause

select bit

Interrupt request cause

select bit

IFSR1

IFSR2

IFSR3

IFSR4

IFSR5

IFSR6

IFSR7

Note: To use INTi (i=4,5) functionality, this bit must be set to a 1.

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