MC68HC000RC12 Datasheet, PDF (123/189 Pages) Freescale Semiconductor, Inc – 8-/16-/32-Bit Microprocessors User’s Manual

Freescale Semiconductor, Inc.
8.7 BIT MANIPULATION INSTRUCTION EXECUTION TIMES
Table 8-8 lists the timing data for the bit manipulation 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 8-8. Bit Manipulation Instruction Execution Times
Dynamic
Instruction
Size
Register
Memory
BCHG
Byte
—
8(1/1)+
Long
8(1/0)*
—
BCLR
Byte
—
8(1/1)+
Long
10(1/0)*
—
BSET
Byte
—
8(1/1)+
Long
8(1/0)*
—
BTST
Byte
—
4(1/0)+
Long
6(1/0)
—
+Add effective address calculation time.
* Indicates maximum value; data addressing mode only.
Static
Register
Memory
—
12(2/1)+
12(2/0)*
—
—
12(2/1)+
14(2/0)*
—
—
12(2/1)+
12(2/0)*
—
—
8(2/0)+
10(2/0)
—
8.8 CONDITIONAL INSTRUCTION EXECUTION TIMES
Table 8-9 lists the timing data for the conditional 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.
Table 8-9. Conditional Instruction Execution Times
Instruction
Bcc
BRA
BSR
DBcc
Displacement
Byte
Word
Byte
Word
Byte
Word
cc true
cc false, Count Not Expired
cc false, Counter Expired
Branch
Taken
10(2/0)
10(2/0)
10(2/0)
10(2/0)
18(2/2)
18(2/2)
—
10(2/0)
—
Branch Not
Taken
8(1/0)
12(2/0)
—
—
—
—
12(2/0)
—
14(3/0)
MOTOROLA
MC68000 8-/16-/32-MICROPROCESSORS USER’S MANUAL
8-7
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