MC68HC000RC12 Datasheet, PDF (138/189 Pages) Freescale Semiconductor, Inc – 8-/16-/32-Bit Microprocessors User’s Manual

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and read the next 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 following notation applies in Table 9-17:
Dn — Data register operand
M — Memory operand
Table 9-17. Multiprecision Instruction Execution Times
Loop Mode
Nonlooped
Continued
Terminated
Valid Count,
cc False
Valid Count, Expired Count
cc True
Instruction
Size
op Dn, Dn
op M, M*
ADDX
Byte, Word
4(1/0)
18(3/1)
22(2/1)
28(4/1)
26(4/1)
Long
6(1/0)
30(5/2)
32(4/2)
38(6/2)
36(6/2)
CMPM
Byte, Word
—
12(3/0)
14(2/0)
20(4/0)
18(4/0)
Long
—
20(5/0)
24(4/0)
30(6/0)
26(6/0)
SUBX
Byte, Word
4(1/)
18(3/1)
22(2/1)
28(4/1)
26(4/1)
Long
6(1/0)
30(5/2)
32(4/2)
38(6/2)
36(6/2)
ABCD
Byte
6(1/0)
18(3/1)
24(2/1)
30(4/1)
28(4/1)
SBCD
Byte
6(1/0)
18(3/1)
24(2/1)
30(4/1)
28(4/1)
*Source and destination ea are (An)+ for CMPM and –(An) for all others.
9.11 MISCELLANEOUS INSTRUCTION EXECUTION TIMES
Table 9-18 lists the timing data for miscellaneous 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 (+).
MOTOROLA
M68000 8-/16-/32-BIT MICROPROCESSORS USER’S MANUAL
9-11
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