MC68020 Motorola, MC68020 Datasheet - Page 250

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

8.2.14 Bit Field Manipulation Instructions
The bit field manipulation instructions table indicates the number of clock periods needed
for the processor to perform the specified bit field operation using 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 Immediate Address Time
NOTE: A bit field of 32 bits may span five bytes that require two operand cycles to access or may span four bytes that
8-36
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require only one operand cycle to access.
BFTST
BFTST
BFTST
BFCHG
BFCHG
BFCHG
BFCLR
BFCLR
BFCLR
BFSET
BFSET
BFSET
BFEXTS
BFEXTS
BFEXTS
BFEXTU
BFEXTU
BFEXTU
BFINS
BFINS
BFINS
BFFFO
BFFFO
BFFFO
Instruction
Dn
Mem (< 5 Bytes)
Dn
Mem (< 5 Bytes)
Dn
Mem (< 5 Bytes)
Dn
Mem (< 5 Bytes)
Mem (5 Bytes)
Dn
Mem (< 5 Bytes)
Mem (5 Bytes)
Dn
Dn
Mem (< 5 Bytes)
Dn
Mem (< 5 Bytes)
Mem (5 Bytes)
Mem (5 Bytes)
Mem (5 Bytes)
Mem (< 5 Bytes)
Mem (5 Bytes)
Mem (5 Bytes)
Mem (5 Bytes)
M68020 USER’S MANUAL
Best Case
11(1/0/0)
15(2/0/0)
16(1/0/1)
24(2/0/2)
16(1/0/1)
24(2/0/2)
16(1/0/1)
24(2/0/2)
13(1/0/0)
18(2/0/0)
13(1/0/0)
18(2/0/0)
14(1/0/1)
20(2/0/2)
15(0/0/0)
24(1/0/0)
32(2/0/0)
3(0/0/0)
9(0/0/0)
9(0/0/0)
9(0/0/0)
5(0/0/0)
5(0/0/0)
7(0/0/0)
Cache Case
11(1/0/0)
15(2/0/0)
12(0/0/0)
16(1/0/1)
24(2/0/2)
12(0/0/0)
16(1/0/1)
24(2/0/2)
12(0/0/0)
16(1/0/1)
24(2/0/2)
13(1/0/0)
18(2/0/0)
13(1/0/0)
18(2/0/0)
10(0/0/0)
14(1/0/1)
20(2/0/2)
18(0/0/0)
24(1/0/0)
32(2/0/0)
6(0/0/0)
8(0/0/0)
8(0/0/0)
Worst Case
12(1/1/0)
16(2/1/0)
12(0/1/0)
16(1/1/1)
24(2/1/2)
12(0/1/0)
16(1/1/1)
24(2/1/2)
12(0/1/0)
16(1/1/1)
24(2/1/2)
13(1/1/0)
18(2/1/0)
13(1/1/0)
18(2/1/0)
10(0/1/0)
15(1/1/1)
21(2/1/2)
18(0/1/0)
24(1/1/0)
32(2/1/0)
7(0/1/0)
8(0/1/0)
8(0/1/0)
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