MC68EC000 Motorola, MC68EC000 Datasheet - Page 113

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

8-Bit Instruction Execution Times
5.4 IMMEDIATE INSTRUCTION EXECUTION TIMES
The numbers of clock periods listed in Table 5-6 include the times to fetch immediate oper-
ands, perform the operations, store the results, and read the next operation. The total num-
ber 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 (+).
In Table 5-6, the following notation applies:
5-4
Dn — Data register operand
An — Address register operand
M — Memory operand
# — Immediate operand
ADD/ADDA
AND
CMP/CMPA
DIVS
DIVU
EOR
MULS
MULU
OR
SUB
+Add effective address calculation time.
*Indicates maximum base value added to word effective address time.
**The base time of 10 clock periods is increased to 12 if the effective address mode is register direct
or immediate (effective address time should also be added).
***Only available effective address mode is data register direct.
MULS, MULU—The multiply algorithm requires 42+2n clocks where n is defined as:
MULS: n = tag the <ea> with a zero as the MSB; n is the resultant number of 10 or 01 patterns in
MULU: n = the number of ones in the <ea>
Instruction
the 17-bit source; i.e., worst case happens when the source is $5555.
Table 5-5. Standard Instruction Execution Times
Freescale Semiconductor, Inc.
EC000 CORE PROCESSOR USER’S MANUAL
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op<ea>, An
10(2/0)+**
10(2/0)+**
12(2/0)+
10(2/0)+
10(2/0)+
12(2/0)+
—
—
—
—
—
—
—
—
—
—
—
—
—
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—
op<ea>, Dn
12(2/0)+***
162(2/0)+*
144(2/0)+*
10(2/0)+**
10(2/0)+**
10(2/0)+**
10(2/0)+**
8(2/0)+***
8(2/0)+***
74(2/0)+*
74(2/0)+*
10(2/0)+
8(2/0)+
8(2/0)+
8(2/0)+
8(2/0)+
8(2/0)+
8(2/0)+
8(2/0)+
8(2/0)+
8(2/0)+
8(2/0)+
op Dn, <M>
12(2/1)+
16(2/2)+
24(2/4)+
12(2/1)+
16(2/2)+
24(2/4)+
12(2/1)+
16(2/2)+
24(2/4)+
12(2/1)+
16(2/2)+
24(2/4)+
12(2/1)+
16(2/2)+
24(2/4)+
—
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