C508_01 Datasheet, PDF (214/267 Pages) Infineon Technologies AG – 8-Bit CMOS Microcontroller

C508
Interrupt System
Special Function Register EINT (Address FB_H)
Reset Value: XX000000_B
MSB
Bit No. 7
6
FB_H
–
–
5
IEX9
4
I9FR
3
IEX8
2
I8FR
1
IEX7
LSB
0
I7FR
EINT
Bit
IEX9
I9FR
IEX8
I8FR
IEX7
I7FR
Function
External interrupt 9 edge flag
Set by hardware when external interrupt edge was detected. Cleared by
hardware when processor vectors to the interrupt routine.
External interrupt 9 rising/falling edge control flag
If I9FR = 0, the external interrupt 9 is activated by a negative edge
transition at P5.5/INT9.
If I9FR = 1, the external interrupt 9 is activated by a positive edge
transition at P5.5/INT9.
External interrupt 8 edge flag
Set by hardware when external interrupt edge was detected. Cleared by
hardware when processor vectors to the interrupt routine.
External interrupt 8 rising/falling edge control flag
If I8FR = 0, the external interrupt 8 is activated by a negative edge
transition at P5.6/INT8.
If I8FR = 1, the external interrupt 8 is activated by a positive edge
transition at P5.6/INT8.
External interrupt 7 edge flag
Set by hardware when external interrupt edge was detected. Cleared by
hardware when processor vectors to the interrupt routine.
External interrupt 7 rising/falling edge control flag
If I7FR = 0, the external interrupt 7 is activated by a negative edge
transition at P5.7/INT7.
If I7FR = 1, the external interrupt 7 is activated by a positive edge
transition at P5.7/INT7.
The external interrupts 7(INT7), 8(INT8) and 9(INT9) can be either positive or negative
transition-activated, depending on bits I7FR, I8FR and I9FR in register EINT. The flags
that actually generate these interrupts are bits IEX7, IEX8 and IEX9 in the same register
EINT. They are cleared by hardware when the respective service routine is vectored to.
User’s Manual
7-16
2001-05