C505_9708 SIEMENS [Siemens Semiconductor Group], C505_9708 Datasheet - Page 180

• Manufacturer Part Number: C505_9708
• Description: 8-Bit CMOS Microcontroller
• Manufacturer: SIEMENS [Siemens Semiconductor Group]

Special Function Register IRCON (Address C0 H )
Bit
EXF2
TF2
IEX6
IEX5
IEX4
IEX3
SWI
IADC
Semiconductor Group
Bit No.
C0 H
Function
Timer 2 external reload flag
EXF2 is set when a reload is caused by a falling edge on pin T2EX while EXEN2 =
1. If ET2 in IEN0 is set (timer 2 interrupt enabled), EXF2 = 1 will cause an interrupt.
EXF2 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 occured at P1.3/AN3/INT6/CC3. Cleared when interrupt is processed.
External interrupt 5 edge flag
Set by hardware when external interrupt edge was detected or when a compare
event occured at P1.2/AN2/INT5/CC2. Cleared when interrupt is processed.
External interrupt 4 edge flag
Set by hardware when external interrupt edge was detected or when a compare
event occured at P1.1/AN1/INT4/CC1. Cleared when interrupt is processed.
External interrupt 3 edge flag
Set by hardware when external interrupt edge was detected or when a compare
event occured at P1.0/AN0/INT3/CC0. Cleared when interrupt is processed.
This bit can be set by software to generate an interrupt. This bit is cleared when the
interrupt is processed. The interrupt vector address is 004B H .
A/D converter interrupt request flag
Set by hardware at the end of an A/D conversion. Must be cleared by software.
EXF2
MSB
C7
H
TF2
C6
H
IEX6
C5
H
IEX5
C4
H
7-9
IEX4
C3
H
IEX3
C2
H
SWI
C1
H
IADC
LSB
Interrupt System
C0
Reset Value : 00 H
H
C505 / C505C
IRCON
1997-08-01