External Interrupt Control Register (Eic) - Fujitsu Semiconductor Controller MB89950/950A Hardware Manual

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).
I External interrupt control register (EIC)
Bit 7
Address
0030 EIR1
H
R/W
R/W : Readable and writable
: Initial value
228
Figure 11.3-3 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
EIE0
0
1
SL01 SL00
0 0
0 1
1 0
1 1
EIR0
0 The specified edge has not been detected.
1
The specified edge has been
EIE1
0
1
SL11 SL10
0 0
0 1
1 0
1 1
EIR1
0
The specified edge has not been
1
The specified edge has been
Bit 2 Bit 1 Bit 0
Initial value
SL01 SL00 EIE0 00000000
R/W R/W R/W
INT0 interrupt request enable bit
Disables output of interrupt requests.
Enables output of interrupt requests.
INT0 edge polarity selection bits
No edge detection
Rising edge
Falling edge
Both edge
INT0 external interrupt request flag bit
Read
detected.
INT1 interrupt request enable bit
Disables output of interrupt requests.
Enables output of interrupt requests.
INT1 edge polarity selection bits
No edge detection
Rising edge
Falling edge
Both edge
INT1 external interrupt request flag bit
Read
detected.
detected.
B
Write
Clears this bit.
No effect. The bit does not change.
Write
Clears this bit.
No effect. The bit does not change.