M16C30L Datasheet, PDF (60/166 Pages) Renesas Technology Corp – SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

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INT Interrupt
Mitsubishi microcomputers
M16C / 30L Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
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INT Interrupt
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INT0 to INT2 are triggered by the edges of external inputs. The edge polarity is selected using the polarity
select bit.
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 1.11.10 shows the Interrupt request cause select register.
Interrupt request cause select register
b7 b6 b5 b4 b3 b2 b1 b0
00 0 0 0
Symbol
IFSR
Address
035F16
Bit symbol
IFSR0
IFSR1
IFSR2
Bit name
INT0 interrupt polarity
switching bit
INT1 interrupt polarity
switching bit
INT2 interrupt polarity
switching bit
Reserved bit
Reserved bit
Reserved bit
Reserved bit
Reserved bit
When reset
0016
Function
0 : One edge
1 : Two edges
0 : One edge
1 : Two edges
0 : One edge
1 : Two edges
Must always be set to “0”
Must always be set to “0”
Must always be set to “0”
Must always be set to “0”
Must always be set to “0”
RW
Figure 1.11.10. Interrupt request cause select register
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