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Semiconductor Group 6 - 1

6 Interrupt System

6.1 Additional Interrupt for Compare Registers CM0 to CM7

There is an additional interrupt which is vectored to on a compare match in one of the eight

comparators of the compare registers CM0 to CM7, when compare mode 1 is selected for the

corresponding channel (assigned to Timer 2 by control bit CMSEL.x). For that purpose the

SAB 80C517A provides eight interrupt request flags (in SFR IRCON1, address 0D1H) which are

ORed to form the interrupt request for that vector, i.e. each of the eight comparators has its own

request flag. Thus the service routine may decide which compare match requested the interrupt.

The corresponding request flag is set by every match in the compare channel when the Compare

Mode 1 is selected for this channel (assigned to Timer 2). If Compare Mode 0 is selected for a

channel (assigned to the Compare Timer), the corresponding interrupt request flag will not be set

on a compare match.

This interrupt is enabled by setting the enable bit ECMP in SFR IEN2. If this bit is set the program

vectors to location 0A3

if one of the eight request flags in IRCON 1 is set.

Figure 6-1 shows a functional block diagram of the new structure concerning the interrupts. The

further functions of this compare unit keep full compatibility to the SAB 80C517.

Interrupt System

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Siemens EF 88H Series Bedienungsanleitung Seite 57