MC68EC000 Motorola, MC68EC000 Datasheet - Page 125

• Manufacturer Part Number: MC68EC000
• Description: Core Processor (SCM 68000)
• Manufacturer: Motorola

16-Bit Instruction Execution Times
6.6 SHIFT/ROTATE INSTRUCTION EXECUTION TIMES
Table 6-7 lists 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 previ-
ously 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 calcu-
lation where indicated by a plus sign (+).
6.7 BIT MANIPULATION INSTRUCTION EXECUTION TIMES
Table 6-8 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 previ-
ously 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 calcu-
lation where indicated by a plus sign (+).
6-6
BCHG
BCLR
BSET
BTST
+ Add effective address calculation time.
* Indicates maximum value—data addressing mode only.
Instruction
Table 6-8. Bit Manipulation Instruction Execution Times
ASR, ASL
LSR, LSL
ROR, ROL
ROXR, ROXL
+ Add effective address calculation time for word operands.
n is the shift count.
Table 6-7. Shift/Rotate Instruction Execution Times
Instruction
Long
Long
Long
Long
Size
Byte
Byte
Byte
Byte
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Register
10(1/0)*
Long
Long
Long
Long
Size
8(1/0)*
8(1/0)*
6(1/0)
—
—
—
—
Dynamic
Memory
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)
8(1/1)+
8(1/1)+
8(1/1)+
4(1/0)+
Register
—
—
—
—
Register
12(2/0)*
14(2/0)*
12(2/0)*
10(2/0)
—
—
—
—
Memory
8(1/1)+
8(1/1)+
8(1/1)+
8(1/1)+
—
—
—
—
Static
Memory
12(2/1)+
12(2/1)+
12(2/1)+
8(2/0)+
—
—
—
—
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