Motorola M68000 - ShiftRotate Instruction Execution Times

9- 8 M68000 8-/16-/32-BIT MICROPROCESSORS USER'S MANUAL MOTOROLA
Table 9-11. Single Operand Instruction Loop Mode Execution Times
Loop Continued Loop Terminated
Valid Count, cc False Valid Count, cc True Expired Count
Instruction Size (An) (An)+ –(An) (An) (An)+ –(An) (An) (An)+ –(An)
CLR Byte,
Word
10(0/1) 10(0/1) 12(0/1) 18(2/1) 18(2/1) 20(2/0) 16(2/1) 16(2/1) 18(2/1)
Long 14(0/2) 14(0/2) 16(0/2) 22(2/2) 22(2/2) 24(2/2) 20(2/2) 20(2/2) 22(2/2)
NBCD Byte 18(1/1) 18(1/1) 20(1/1) 24(3/1) 24(3/1) 26(3/1) 22(3/1) 22(3/1) 24(3/1)
NEG Byte,
Word
16(1/1) 16(1/1) 18(2/2) 22(3/1) 22(3/1) 24(3/1) 20(3/1) 20(3/1) 22(3/1)
Long 24(2/2) 24(2/2) 26(2/2) 30(4/2) 30(4/2) 32(4/2) 28(4/2) 28(4/2) 30(4/2)
NEGX Byte,
Word
16(1/1) 16(1/1) 18(2/2) 22(3/1) 22(3/1) 24(3/1) 20(3/1) 20(3/1) 22(3/1)
Long 24(2/2) 24(2/2) 26(2/2) 30(4/2) 30(4/2) 32(4/2) 28(4/2) 28(4/2) 30(4/2)
NOT Byte,
Word
16(1/1) 16(1/1) 18(2/2) 22(3/1) 22(3/1) 24(3/1) 20(3/1) 20(3/1) 22(3/1)
Long 24(2/2) 24(2/2) 26(2/2) 30(4/2) 30(4/2) 32(4/2) 28(4/2) 28(4/2) 30(4/2)
TST Byte,
Word
12(1/0) 12(1/0) 14(1/0) 18(3/0) 18(3/0) 20(3/0) 16(3/0) 16(3/0) 18(3/0)
Long 18(2/0) 18(2/0) 20(2/0) 24(4/0) 24(4/0) 26(4/0) 20(4/0) 20(4/0) 22(4/0)
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 Size Register Memory*
ASR, ASL Byte, Word 6+2n(1/0) 8(1/1)+
Long 8+2n(1/0) —
LSR, LSL Byte, Word 6+2n(1/0) 8(1/1)+
Long 8+2n(1/0) —
ROR, ROL Byte, Word 6+2n(1/0) 8(1/1)+
Long 8+2n(1/0) —
ROXR, ROXL Byte, Word 6+2n(1/0) 8(1/1)+
Long 8+2n(1/0) —
+Add effective address calculation time.
n is the shift or rotate count.
* Word only.
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