Control Instructions - Motorola MC68020 User Manual

8.2.16 Control Instructions

The control instructions table indicates the number of clock periods needed for the
processor to perform the specified operation. Footnotes specify when it is necessary to
add an 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
ANDI to SR
EORI to SR
ORI to SR
ANDI to CCR
EORI to CCR
ORI to CCR
BSR
**
CALLM (Type 0)
**
CALLM (Type 1)—No Stack Copy
**
CALLM (Type 1)—No Stack Copy
**
CALLM (Type 1)—Stack Copy
‡ CAS (Successful Compare)
‡ CAS (Unsuccessful Compare)
CAS2 (Successful Compare)
CAS2 (Unsuccessful Compare)
*
CHK
**
CHK2 EA,Rn
% JMP
% JSR
† LEA
LINK.W
LINK.L
NOP
† PEA
RTD
RTM (Type 0)
RTM (Type 1)
RTR
RTS
UNLK
n—Number of Operand Transfers Required
*
Add Fetch Effective Address Time
†Add Calculate Effective Address Time
8-38
Best Case
9(0/0/0)
9(0/0/0)
9(0/0/0)
9(0/0/0)
9(0/0/0)
9(0/0/0)
5(0/0/1)
28(2/0/6)
48(5/0/8)
55(6/0/8)
63 + 6n (7 + n/0/8 + n)
15(1/0/1)
12(1/0/0)
23(2/0/2)
19(2/0/0)
8(0/0/0)
16(2/0/0)
1(0/0/0)
3(0/0/1)
2(0/0/0)
3(0/0/1)
4(0/0/1)
2(0/0/0)
3(0/0/1)
9(1/0/0)
18(4/0/0)
31(6/0/1)
13(2/0/0)
9(1/0/0)
5(1/0/0)
%—Add Jump Effective Address Time
**
Add Fetch Immediate Address Time
‡Add Calculate Immediate Address Time
M68020 USER'S MANUAL
Cache Case
12(0/0/0)
12(0/0/0)
12(0/0/0)
12(0/0/0)
12(0/0/0)
12(0/0/0)
7(0/0/1)
30(2/0/6)
50(5/0/8)
57(6/0/8)
65 + 6n (7 + n/0/8 + n) 71 + 6n (7 + n/2/8 + n)
15(1/0/1)
12(1/0/0)
25(2/0/2)
22(2/0/0)
8(0/0/0)
18(2/0/0)
4(0/0/0)
5(0/0/1)
2(0/0/0)
5(0/0/1)
6(0/0/1)
2(0/0/0)
5(0/0/1)
10(1/0/0)
19(4/0/0)
32(6/0/1)
14(2/0/0)
10(1/0/0)
6(1/0/0)
Worst Case
15(0/2/0)
15(0/2/0)
15(0/2/0)
15(0/2/0)
15(0/2/0)
15(0/2/0)
13(0/2/1)
36(2/2/6)
56(5/2/8)
64(6/2/8)
16(1/1/1)
13(1/1/0)
28(2/2/2)
25(2/2/0)
8(0/1/0)
18(2/1/0)
7(0/2/0)
11(0/2/1)
3(0/1/0)
7(0/1/1)
10(0/2/1)
3(0/1/0)
6(0/1/1)
12(1/2/0)
22(4/2/0)
35(6/2/1)
15(2/2/0)
12(1/2/0)
7(1/1/0)
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