M16CSLASH62 datasheet(81/621 Pages) RENESAS

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Mitsubishi microcomputers

M16C / 62 Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

______

INT Interrupt

______

INT Interrupt

________

INT0 to INT5 are triggered by the edges of external inputs. The edge polarity is selected using the polarity

select bit.

________

Of interrupt control registers, 004816 is used both as serial I/O4 and external interrupt INT5 input control

________

interrupt request cause select bits - bits 6 and 7 of the interrupt request cause select register (035F16) - to

specify which interrupt request cause to select. After having set an interrupt request cause, be sure to clear

the corresponding interrupt request bit before enabling an interrupt.

Either of the interrupt control registers - 004816, 004916 - has the polarity-switching bit. Be sure to set this bit

to “0” to select an serial I/O as the interrupt request cause.

As for external interrupt input, an interrupt can be generated both at the rising edge and at the falling edge

by setting “1” in the INTi interrupt polarity switching bit of the interrupt request cause select register

(035F16). To select both edges, set the polarity switching bit of the corresponding interrupt control register

to ‘falling edge’ (“0”).

Figure 1.14.10 shows the Interrupt request cause select register.

Figure 1.14.10. 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 : SIO3

1 : INT4

0 : SIO4

1 : INT5

0 : One edge

1 : Two edges

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

INT2 interrupt polarity

switching bit

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

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