External Interrupt Circuit; Fig. 2.43 External Interrupt Circuit Block Diagram - Fujitsu MB89140 Series Hardware Manual

EXTERNAL INTERRUPT
CIRCUIT
INT1
INT0
Address: 000F EIC
H
HARDWARE CONFIGURATION

2.14 EXTERNAL INTERRUPT CIRCUIT

The edges of two external-interrupt sources (INT0 and INT1) can be de-
tected to set the corresponding flag.
An interrupt can be generated at the same time the flag is set.
Both interrupt can release the STOP or SLEEP mode.
Block Diagram
EIR1 SL11 SL10 EIE1
1 X
0 0
0 1
MPX

Fig. 2.43 External Interrupt Circuit Block Diagram

Register List
Address: 000F
H
Description of Registers
External-interrupt control register (EIC)
The EIC controls an interrupt by the IRQ pin.
Bit 7
Address: 000F EIR1
H
(R/W)
2-85
EIR0 SL01 SL00 EIE0
8 bit
R/W External-interrupt control register
EIC
Bit 6 Bit 5 Bit 4 Bit 3
SL11 SL10 EIE1 EIR0
(R/W) (R/W) (R/W) (R/W)
IRQ1
IRQ0
EIC
1 X
0 0
0 1
MPX
Bit 2 Bit 1 Bit 0
SL01 SL00 EIE0
(R/W) (R/W) (R/W)
Initial value
00000000
B