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CHAPTER 11 EXTERNAL INTERRUPT CIRCUIT (EDGE)
11.3.1 External Interrupt Control Register (EIC)
External interrupt control register (EIC) is used to select the edge polarity and to control
interrupts for external interrupt pins (INT0, INT1).
■ External interrupt control register (EIC)
Figure 11.3-3 External interrupt control register (EIC)
Address Initial value
0030
H
EIR1 SL11 SL10 EIE1 EIR0 SL01 SL00 EIE0 00000000
B
R/W R/W R/W R/W R/W R/W R/W R/W
EIE0 INT0 interrupt request enable bit
0
Disables output of interrupt requests.
1
Enables output of interrupt requests.
SL01 SL00 INT0 edge polarity selection bits
0 0
No edge detection
01
Rising edge
10
Falling edge
11
Both edge
EIR0
INT0 external interrupt request flag bit
Read Write
0
The specified edge has not been detected.
Clears this bit.
1
The specified edge has been No effect. The bit does not change.
EIE1 INT1 interrupt request enable bit
0
Disables output of interrupt requests.
1
Enables output of interrupt requests.
SL11 SL10 INT1 edge polarity selection bits
0 0
No edge detection
01
Rising edge
10
Falling edge
11
Both edge
EIR1
INT1 external interrupt request flag bit
Read Write
0
The specified edge has not been
Clears this bit.
1
The specified edge has been
No effect. The bit does not change.
R/W : Readable and writable
: Initial value
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
detected.
detected.
detected.