C515A_9708 Datasheet, PDF (132/182 Pages) Siemens Semiconductor Group – 8-Bit CMOS Microcontroller

Interrupt System
C515A
7.1.3 Interrupt Priority Registers
The lower six bits of these two registers are used to define the interrupt priority level of the interrupt
groups as they are defined in table 7-1 in the next section.
Special Function Register IP0 (Address A9H)
Special Function Register IP1 (Address B9H)
Reset Value : 00H
Reset Value : XX000000B
MSB
LSB
Bit No. 7
6
5
4
3
2
1
0
A9H OWDS WDTS IP0.5 IP0.4 IP0.3 IP0.2 IP0.1 IP0.0 IP0
Bit No. 7
B9H
–
6
5
4
3
2
1
0
– IP1.5 IP1.4 IP1.3 IP1.2 IP1.1 IP1.0 IP1
Bit
IP1.x
IP0.x
The shaded bits are not used for interrupt control.
Function
Interrupt group priority level bits (x=1-6, see table 7-1)
IP1.x
0
0
1
1
IP0.x
0
1
0
1
Function
Interrupt group x is set to priority level 0 (lowest)
Interrupt group x is set to priority level 1
Interrupt group x is set to priority level 2
Interrupt group x is set to priority level 3 (highest)
Semiconductor Group
7-11
1997-08-01