MOTOROLA M68020 USER’S MANUAL 8- 39
8.2.17 Exception-Related Instructions
The exception-related instructions table indicates the number of clock periods needed for
the processor to perform the specified exception-related action. Footnotes specify when it
is necessary to add the entry from another table to calculate the total effective execution
time for the given instruction. The total number of clock cycles is outside the parentheses;
the number of read, prefetch, and write cycles is given inside the parentheses as (r/p/w).
These cycles are included in the total clock cycle number.
Instruction Best Case Cache Case Worst Case
BKPT 9(1/0/0) 10(1/0/0) 10(1/0/0)
Interrupt (I-Stack) 26(2/0/4) 26(2/0/4) 33(2/2/4)
Interrupt (M-Stack) 41(2/0/8) 41(2/0/8) 48(2/2/8)
RESET Instruction 518(0/0/0) 518(0/0/0) 519(0/1/0)
STOP 8(0/0/0) 8(0/0/0) 8(0/0/0)
Trace 25(1/0/5) 25(1/0/5) 32(1/2/5)
TRAP #n 20(1/0/4) 20(1/0/4) 27(1/2/4)
Illegal Instruction 20(1/0/4) 20(1/0/4) 27(1/2/4)
A-Line Trap 20(1/0/4) 20(1/0/4) 27(1/2/4)
F-Line Trap 20(1/0/4) 20(1/0/4) 27(1/2/4)
Privilege Violation 20(1/0/4) 20(1/0/4) 27(1/2/4)
TRAPcc (Trap) 23(1/0/5) 25(1/0/5) 32(1/2/5)
TRAPcc (No Trap) 1(0/0/0) 4(0/0/0) 5(0/1/0)
TRAPcc.W (Trap) 23(1/0/5) 25(1/0/5) 33(1/3/5)
TRAPcc.W (No Trap) 3(0/0/0) 6(0/0/0) 7(0/1/0)
TRAPcc.L (Trap) 23(1/0/5) 25(1/0/5) 33(1/3/5)
TRAPcc.L (No Trap) 5(0/0/0) 8(0/0/0) 10(0/2/0)
TRAPV (Trap) 23(1/0/5) 25(1/0/5) 32(1/2/5)
TRAPV (No Trap) 1(0/0/0) 4(0/0/0) 5(0/1/0)
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