MC68020 Motorola, MC68020 Datasheet - Page 252

• Manufacturer Part Number: MC68020
• Description: (MC68020 / MC68EC020) MICROPROCESSORS USERS MANUAL
• Manufacturer: Motorola

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.
n—Number of Operand Transfers Required
*
†Add Calculate Effective Address Time
8-38
**
**
**
**
‡
‡
*
**
%
%
†
†
Add Fetch Effective Address Time
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
Instruction
M68020 USER’S MANUAL
63 + 6n (7 + n/0/8 + n)
%—Add Jump Effective Address Time
‡Add Calculate Immediate Address Time
**
Best Case
Add Fetch Immediate Address Time
28(2/0/6)
48(5/0/8)
55(6/0/8)
15(1/0/1)
12(1/0/0)
23(2/0/2)
19(2/0/0)
16(2/0/0)
18(4/0/0)
31(6/0/1)
13(2/0/0)
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)
8(0/0/0)
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)
9(1/0/0)
5(1/0/0)
65 + 6n (7 + n/0/8 + n)
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)
30(2/0/6)
50(5/0/8)
57(6/0/8)
15(1/0/1)
12(1/0/0)
25(2/0/2)
22(2/0/0)
18(2/0/0)
10(1/0/0)
19(4/0/0)
32(6/0/1)
14(2/0/0)
10(1/0/0)
7(0/0/1)
8(0/0/0)
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)
6(1/0/0)
71 + 6n (7 + n/2/8 + n)
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)
18(2/1/0)
11(0/2/1)
10(0/2/1)
12(1/2/0)
22(4/2/0)
35(6/2/1)
15(2/2/0)
12(1/2/0)
8(0/1/0)
7(0/2/0)
3(0/1/0)
7(0/1/1)
3(0/1/0)
6(0/1/1)
7(1/1/0)
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