Shift/Rotate Instruction Execution Times - Motorola M68000 User Manual

Table 9-11. Single Operand Instruction Loop Mode Execution Times
Instruction Size
CLR Byte, 10(0/1)
Word
Long 14(0/2)
NBCD Byte 18(1/1)
NEG Byte, 16(1/1)
Word
Long 24(2/2)
NEGX Byte, 16(1/1)
Word
Long 24(2/2)
NOT Byte, 16(1/1)
Word
Long 24(2/2)
TST Byte, 12(1/0)
Word
Long 18(2/0)

9.6 SHIFT/ROTATE INSTRUCTION EXECUTION TIMES

Tables 9-12 and 9-13 list the timing data for the shift and rotate instructions. The total
number of clock periods, the number of read cycles, and the number of write cycles are
shown in the previously described format. The number of clock periods, the number of
read cycles, and the number of write cycles, respectively, must be added to those of the
effective address calculation where indicated by a plus sign (+).
Table 9-12. Shift/Rotate Instruction Execution Times
Instruction
ASR, ASL
LSR, LSL
ROR, ROL
ROXR, ROXL
+Add effective address calculation time.
n is the shift or rotate count.
* Word only.
9-8 M68000 8-/16-/32-BIT MICROPROCESSORS USER'S MANUAL
Freescale Semiconductor, Inc.
Loop Continued
Valid Count, cc False
(An) (An)+ –(An)
10(0/1) 12(0/1)
14(0/2) 16(0/2)
18(1/1) 20(1/1)
16(1/1) 18(2/2)
24(2/2) 26(2/2)
16(1/1) 18(2/2)
24(2/2) 26(2/2)
16(1/1) 18(2/2)
24(2/2) 26(2/2)
12(1/0) 14(1/0)
18(2/0) 20(2/0)
Size
Byte, Word
Long
Byte, Word
Long
Byte, Word
Long
Byte, Word
Long
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Loop Terminated
Valid Count, cc True
(An) (An)+ –(An)
18(2/1) 18(2/1) 20(2/0)
22(2/2) 22(2/2) 24(2/2)
24(3/1) 24(3/1) 26(3/1)
22(3/1) 22(3/1) 24(3/1)
30(4/2) 30(4/2) 32(4/2)
22(3/1) 22(3/1) 24(3/1)
30(4/2) 30(4/2) 32(4/2)
22(3/1) 22(3/1) 24(3/1)
30(4/2) 30(4/2) 32(4/2)
18(3/0) 18(3/0) 20(3/0)
24(4/0) 24(4/0) 26(4/0)
Register
6+2n (1/0)
8+2n (1/0)
6+2n (1/0)
8+2n (1/0)
6+2n (1/0)
8+2n (1/0)
6+2n (1/0)
8+2n (1/0)
Expired Count
(An) (An)+ –(An)
16(2/1) 16(2/1) 18(2/1)
20(2/2) 20(2/2) 22(2/2)
22(3/1) 22(3/1) 24(3/1)
20(3/1) 20(3/1) 22(3/1)
28(4/2) 28(4/2) 30(4/2)
20(3/1) 20(3/1) 22(3/1)
28(4/2) 28(4/2) 30(4/2)
20(3/1) 20(3/1) 22(3/1)
28(4/2) 28(4/2) 30(4/2)
16(3/0) 16(3/0) 18(3/0)
20(4/0) 20(4/0) 22(4/0)
Memory*
8(1/1)+
—
8(1/1)+
—
8(1/1)+
—
8(1/1)+
—
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