C505_9708 SIEMENS [Siemens Semiconductor Group], C505_9708 Datasheet - Page 177

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

The IEN1 register contains enable/disable flags of the timer 2 external timer reload interrupt, the
external interrupts 2 and 3, the CAN controller interrupt and the A/D converter interrupt.
Special Function Register IEN1 (Address B8 H )
Bit
EXEN2
EX6
EX5
EX4
EX3
ECAN
EADC
Semiconductor Group
Bit No.
B8 H
EXEN2 SWDT
Function
Timer 2 external reload interrupt enable
If EXEN2 = 0, the timer 2 external reload interrupt is disabled.
If EXEN2 = 1, the timer 2 external reload interrupt is enabled. 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.
If EX6 = 1, external interrupt 6 is enabled.
External interrupt 5 / capture/compare interrupt 2 enable
If EX5 = 0, external interrupt 5 is disabled.
If EX5 = 1, external interrupt 5 is enabled.
External interrupt 4 / capture/compare interrupt 1 enable
If EX4 = 0, external interrupt 4 is disabled.
If EX4 = 1, external interrupt 4 is enabled.
External interrupt 3 / capture/compare interrupt 0 enable
If EX3 = 0, external interrupt 3 is disabled.
If EX3 = 1, external interrupt 3 is enabled.
CAN controller interrupt enable (C505C only)
If ECAN = 0, the CAN controller interrupt is disabled.
If ECAN = 1, the CAN controller interrupt is enabled.
This bit must be set in order to enable the software interrupt at bit SWI (for C505
and C505C)
A/D converter interrupt enable
If EADC = 0, the A/D converter interrupt is disabled.
If EADC = 1, the A/D converter interrupt is enabled.
MSB
BF
H
The shaded bits are not used for interrupt control.
BE
H
EX6
BD
H
EX5
BC
H
7-6
EX4
BB
H
EX3
BA
H
ECAN EADC
B9
H
LSB
Interrupt System
B8
Reset Value : 00 H
H
C505 / C505C
IEN1
1997-08-01