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Interrupts5-6 SPRU733
5.1.2 Interrupt Service Table (IST)
When the CPU begins processing an interrupt, it references the interrupt
service table (IST). The IST is a table of fetch packets that contain code for
servicing the interrupts. The IST consists of 16 consecutive fetch packets.
Each interrupt service fetch packet (ISFP) contains eight instructions. A simple
interrupt service routine may fit in an individual fetch packet.
The addresses and contents of the IST are shown in Figure 5−1. Because
each fetch packet contains eight 32-bit instruction words (or 32 bytes), each
address in the table is incremented by 32 bytes (20h) from the one adjacent
to it.
Figure 5−1. Interrupt Service Table
000h
020h
040h
060h
080h
0A0h
0C0h
0E0h
100h
120h
140h
160h
180h
1A0h
1C0h
1E0h
Program memory
RESET
ISFP
NMI ISFP
Reserved
Reserved
INT4 ISFP
INT5 ISFP
INT6 ISFP
INT7 ISFP
INT8 ISFP
INT9 ISFP
INT10 ISFP
INT11 ISFP
INT12 ISFP
INT13 ISFP
INT14 ISFP
INT15 ISFP