MC68020 Motorola, MC68020 Datasheet - Page 247
MC68020
Manufacturer Part Number
MC68020
Description
(MC68020 / MC68EC020) MICROPROCESSORS USERS MANUAL
Manufacturer
Motorola
Datasheet
1.MC68020.pdf
(306 pages)
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8.2.11 Single-Operand Instructions
The single-operand instructions table indicates the number of clock periods needed for the
processor to perform the specified operation on the given addressing mode. Footnotes
indicate when it is necessary to add another table entry to calculate the total effective
execution time for the 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.
*
†Add Calculate Effective Address Time
MOTOROLA
†
*
*
*
†
†
*
Add Fetch Effective Address Time
CLR
CLR
NEG
NEG
NEGX
NEGX
NOT
NOT
EXT
NBCD
Scc
Scc
TAS
TAS
TST
Instruction
Dn
Mem
Dn
Mem
Dn
Mem
Dn
Mem
Dn
Dn
Dn
Mem
Dn
Mem
EA
M68020 USER’S MANUAL
Best Case
12(1/0/1)
0(0/0/0)
3(0/0/1)
0(0/0/0)
3(0/0/1)
0(0/0/0)
3(0/0/1)
0(0/0/0)
3(0/0/1)
1(0/0/0)
6(0/0/0)
1(0/0/0)
6(0/0/1)
1(0/0/0)
0(0/0/0)
Cache Case
12(1/0/1)
2(0/0/0)
4(0/0/1)
2(0/0/0)
4(0/0/1)
2(0/0/0)
4(0/0/1)
2(0/0/0)
4(0/0/1)
4(0/0/0)
6(0/0/0)
4(0/0/0)
6(0/0/1)
4(0/0/0)
2(0/0/0)
Worst Case
13(1/1/1)
3(0/1/0)
6(0/1/1)
3(0/1/0)
6(0/1/1)
3(0/1/0)
6(0/1/1)
3(0/1/0)
6(0/1/1)
4(0/1/0)
6(0/1/0)
4(0/1/0)
6(0/1/1)
4(0/1/0)
3(0/1/0)
8- 33
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