MOTOROLA MC68000 8-/16-/32-MICROPROCESSORS USER’S MANUAL 8- 11
the handler routine. The total number of clock periods, the number of read cycles, and the
number of write cycles are shown in the previously described format. The number of clock
periods, the number of read cycles, and the number of write cycles, respectively, must be
added to those of the effective address calculation where indicated by a plus sign (+).
Table 8-14. Exception Processing
Execution Times
Exception Periods
Address Error 50(4/7)
Bus Error 50(4/7)
CHK Instruction 40(4/3)+
Divide by Zero 38(4/3)+
Illegal Instruction 34(4/3)
Interrupt 44(5/3)*
Privilege Violation 34(4/3)
RESET ** 40(6/0)
Trace 34(4/3)
TRAP Instruction 34(4/3)
TRAPV Instruction 34(5/3)
+ Add effective address calculation time.
* The interrupt acknowledge cycle is assumed to take
four clock periods.
** Indicates the time from when RESET and HALT are first
sampled as negated to when instruction execution starts.
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cale Semiconductor,
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