Motorola DSP56000, 24-Bit Digital Signal Processor DSP56K Fast Interrupt, DSP56K Long Interrupt

EXCEPTION PROCESSING STATE (INTERRUPT PROCESSING)

FAST INTERRUPT SERVICE ROUTINE

MAIN

PROGRAM

$0100	—
$0101	MACR
$0102	MOVE
$0103	MAC
$0104	REP
$0105	MAC
$0106	—

SSI RECEIVE DATA

INTERRUPT

RECOGNIZED

$000C	MOVEP
$000D	XXXXXX

IMPLICIT RETURN

FROM INTERRUPT

(a) DSP56K Fast Interrupt

MAIN

PROGRAM

$0100 —

LONG INTERRUPT SERVICE ROUTINE

SSI RECEIVE DATA

WITH EXCEPTION STATUS

$0101	MACR
$0102	MOVE
$0103	MAC
$0104	REP
$0105	MAC
$0106	—

INTERRUPT

RECOGNIZED

EXPLICIT RETURN FROM INTERRUPT

RECOGNIZED

$000E	JSR
$000F	$0300

$0300	—
$0301	DO
$0303	MOVE
$0304	RTI

JSR INSTRUCTION FORMS LONG INTERRUPT SERVICE

(b) DSP56K Long Interrupt

Figure 7-1 Fast and Long Interrupt Examples

and their IPLs are listed in Table 7-6.For information on on-chip peripheral interrupt pri-

MOTOROLA PROCESSING STATES 7 - 13