C509-L_97 SIEMENS [Siemens Semiconductor Group], C509-L_97 Datasheet - Page 206

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

7.2.2 Interrupt Priority Registers
The 19 interrupt sources of the C509-L are combined to six interrupt groups (see table 7-1). Each
of the six interrupt groups can be programmed to one of four priority levels by setting or clearing a
bit in the IP0 and IP1 priority registers. Further details about the interrupt priority structure are given
in chapter 7.3.
Special Function Register IP0 (Address A9 H )
Special Function Register IP1 (Address B9 H )
Bit
IP1.x
IP1.x
Semiconductor Group
Bit No.
B9 H
A9 H
The shaded bits are not used for interrupt purposes.
OWDS WDTS
PDIR
MSB
7
7
Function
Interrupt Priority level bits (x=0-5)
IP1.x
0
0
1
1
–
6
6
IP1.5
IP0.5
IP0.x
0
1
0
1
5
5
IP1.4
IP0.4
4
4
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)
7-10
IP1.3
IP0.3
3
3
IP1.2
IP0.2
2
2
IP1.1
IP0.1
1
1
Reset Value : 0X000000 B
IP1.0
Interrupt System
IP0.0
LSB
0
0
Reset Value : 00 H
IP1
IP0
1997-10-01
C509-L