Motorola MC68020 User Manual

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

Motorola MC68020 Specifications

General

Brand	Motorola
Model	MC68020
Category	Computer Hardware
Language	English