C509-L_97 SIEMENS [Siemens Semiconductor Group], C509-L_97 Datasheet - Page 203

• Manufacturer Part Number: C509-L_97
• Description: 8-Bit CMOS Microcontroller
• Manufacturer: SIEMENS [Siemens Semiconductor Group]

The SFR IEN1 includes the enable bits for the external interrupts 2 to 6, for the AD converter
interrupt, and for the timer 2 external reload interrupt.
Special Function Register IEN1 (Address B8 H )
Bit
EXEN2
EX6
EX5
EX4
EX3
EX2
EADC
Semiconductor Group
Bit No.
B8 H
The shaded bit is not used for interrupt control
EXEN2 SWDT
Function
Timer 2 external reload interrupt enable
If EXEN2 = 0, the timer 2 external reload interrupt is disabled.
The external reload function is not affected by EXEN2.
External interrupt 6 / capture/compare interrupt 3 enable
If EX6 = 0, external interrupt 6 is disabled.
External interrupt 5 / capture/compare interrupt 2 enable
If EX5 = 0, external interrupt 5 is disabled.
External interrupt 4 / capture/compare interrupt 1 enable
If EX4 = 0, external interrupt 4 is disabled.
External interrupt 3 / capture/compare interrupt 0 enable
If EX3 = 0, external interrupt 3 is disabled.
External interrupt 2 / capture/compare interrupt 4 enable
If EX2 = 0, external interrupt 2 is disabled.
Timer 2 external reload interrupt enable
If EADC = 0, the A/D converter interrupt is disabled
MSB
BF
H
BE
H
EX6
BD
H
EX5
BC
H
7-7
EX4
BB
H
EX3
BA
H
EX2
B9
H
EADC
LSB
Interrupt System
B8
Reset Value : 00 H
H
IEN1
1997-10-01
C509-L