C509-L_97 Datasheet, PDF (197/290 Pages) Siemens Semiconductor Group – 8-Bit CMOS Microcontroller

Interrupt System
C509-L
7 Interrupt System
The C509-L provides 19 interrupt sources with four priority levels. 12 interrupts can be generated by
the on-chip peripherals and 7 interrupts may be triggered externally.
The interrupt structure of the C509-L has been mainly adapted from the SAB 80C517A
microcontroller. Thus, each interrupt source has its dedicated interrupt vector and can be enabled/
disabled individually. There are also four priority levels available.
In the C509-L the 19 interrupt sources are combined to six groups of three or four interrupt sources.
Each interrupt group can be programmed to one of the four interrupt priority levels.
7.1 Structure of the Interrupt System
Figure 7-1 to 7-4 give a general overview of the interrupt sources and illustrate the request and
control flags described in the next sections.
Semiconductor Group
7-1
1997-10-01