C508_01 Datasheet, PDF (199/267 Pages) Infineon Technologies AG – 8-Bit CMOS Microcontroller

C508
Interrupt System
7
Interrupt System
The C508 provides nineteen interrupt vectors with four priority levels. Nine interrupt
requests are generated by the on-chip peripherals (Timer 0, Timer 1, Timer 2, Serial
Channel, A/D Converter, and the Capture/Compare Unit with four interrupts); ten
interrupts may be triggered externally. Four of the external interrupts (INT3, INT4, INT5
and INT6) can also be generated by Timer 2 in the capture/compare mode.
The wake-up from power-down mode interrupt has a special functionality which allows
the software power-down mode to be terminated by a short negative pulse at pins P3.2/
INT0 or P5.7/INT7.
The nineteen interrupt sources are divided into six groups. Each group can be
programmed to one of the four interrupt priority levels.
7.1
Structure of the Interrupt System
Figure 7-1 through Figure 7-5 provide a general overview of the interrupt sources and
illustrate the request and control flags described in the following sections.
User’s Manual
7-1
2001-05