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CHAPTER 10 EXTERNAL INTERRUPT CIRCUIT 1 (EDGE)
10.4.2 External Interrupt Control Register 2 (EIC2)
As with external interrupt control register 1 (EIC1), external interrupt control register 2
(EIC2) comprises bits for edge polarity selection and interrupt control for the INT12
external interrupt pin.
■ External Interrupt Control Register 2 (EIC2)
Figure 10.4-3 External Interrupt Control Register 2 (EIC2)
EIE2
0
1
SL21 SL20
00
01
10
11
EIR2
0
1
bit7 bit6 bit5 bit4 bit3bit2 bit1 bit0
0025
H
EIR2
SL21 SL20 EIE2
----0000
B
R/W R/W R/W R/W
R/W : Readable/Writable
: Initial value
: Unused
Address Initial value
Interrupt request enable bit 2
Disables interrupt request outputs
Enables interrupt request outputs
Edge polarity selection bits 2
Edge detection OFF
Rising edge
Falling edge
Both edges
External interrupt request flag bit 2
When being read
When being written
Signal input with specified edge
or edges
not detected
This bit is cleared
Signal input with specified edge
or edges detected
No change, not affecting other
operation