C517A_99 Datasheet, PDF (181/218 Pages) Siemens Semiconductor Group – 8-Bit CMOS Microcontroller

Interrupt System
C517A
Special Function Register IRCON0 (Address C0H)
Reset Value : 00H
Bit No.
C0H
MSB
C7_H
EXF2
C6_H C5_H
TF2 IEX6
C4_H C3_H C2_H
IEX5 IEX4 IEX3
LSB
C1_H C0_H
IEX2 IADC
IRCON0
Bit
EXF2
TF2
IEX6
IEX5
IEX4
IEX3
IEX2
IADC
Function
Timer 2 external reload flag
Set when a reload is caused by a negative transition on pin T2EX while EXEN2 =
1. If ET2 in IEN0 is set (timer 2 interrupt enabled), EXF2 = 1 will cause an interrupt.
Can be used as an additional external interrupt when the reload function is not
used. EXF2 must be cleared by software.
Timer 2 overflow flag
Set by a timer 2 overflow and must be cleared by software. If the timer 2 interrupt
is enabled, TF2 = 1 will cause an interrupt.
External interrupt 6 edge flag
Set by hardware when external interrupt edge was detected or when a compare
event occurred at pin 1.3/INT6/CC3. Cleared by hardware when processor vectors
to interrupt routine.
External interrupt 5 edge flag
Set by hardware when external interrupt edge was detected or when a compare
event occurred at pin 1.2/INT5/CC2. Cleared by hardware when processor vectors
to interrupt routine.
External interrupt 4 edge flag
Set by hardware when external interrupt edge was detected or when a compare
event occurred at pin 1.1/INT4/CC1. Cleared by hardware when processor vectors
to interrupt routine.
External interrupt 3 edge flag
Set by hardware when external interrupt edge was detected or when a compare
event occurred at pin 1.0/INT3/CC0. Cleared by hardware when processor vectors
to interrupt routine.
External interrupt 2 edge flag
Set by hardware when external interrupt edge was detected or when a compare
event occurred at pin 1.4/INT2/CC4. Cleared by hardware when processor vectors
to interrupt routine.
A/D converter interrupt request flag
Set by hardware at the end of a conversion. Must be cleared by software.
Semiconductor Group
7-11