MC68EC000 Motorola, MC68EC000 Datasheet - Page 121

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

16-Bit Instruction Execution Times
6.2 MOVE INSTRUCTION EXECUTION TIMES
Table 6-2 and Table 6-3 list the numbers of clock periods required for the move instructions.
The totals include instruction fetch, operand reads, and operand writes. The total number of
clock periods, the number of read cycles, and the number of write cycles are shown in the
previously described format.
6-2
Dn
An**
(An)
(An)+
–(An)
(d 16 , An)
(d 8 , An, Xn)*
(xxx).W
(xxx).L
(d 16 , PC)
(d 8 , PC, Xn)*
#<data>
*The size of the index register (Xn) does not affect execution time.
**Only word operands; byte operands not allowed.
Source
Dn
An
(An)
(An)+
–(An)
(d 16 , An)
(d 8 , An, Xn)*
(xxx).W
(xxx).L
(d 8 , PC)
(d 16 , PC, Xn)*
#<data>
*The size of the index register (Xn) does not affect execution time.
Table 6-2. Move Byte and Word Instruction Execution Times
10 (2/0)
12 (3/0)
14 (3/0)
12 (3/0)
16 (4/0)
12(3/0)
14(3/0)
4 (1/0)
4 (1/0)
8 (2/0)
8 (2/0)
8(2/0)
Dn
Data Register Direct
Address Register Direct
Address Register Indirect
Address Register Indirect with Postincrement
Address Register Indirect with Predecrement
Address Register Indirect with Displacement
Address Register Indirect with Index
Absolute Short
Absolute Long
Program Counter Indirect with Displacement
Program Counter Indirect with Index
Immediate
Table 6-1. Effective Address Calculation Times
10 (2/0)
12 (3/0)
14 (3/0)
12 (3/0)
16 (4/0)
12(3/0)
14(3/0)
4 (1/0)
4 (1/0)
8 (2/0)
8 (2/0)
8(2/0)
An
Addressing Mode
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EC000 CORE PROCESSOR USER’S MANUAL
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12 (2/1)
12 (2/1)
14 (2/1)
16 (3/1)
18 (3/1)
16 (3/1)
20 (4/1)
16(3/1)
18(3/1)
12(2/1)
8 (1/1)
8 (1/1)
(An)
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12 (2/1)
14 (2/1)
16 (3/1)
12 (2/1)
16 (3/1)
18 (3/1)
20 (4/1)
16(3/1)
18(3/1)
12(2/1)
(An)+
8 (1/1)
8 (1/1)
Register
Memory
12 (2/1)
12 (2/1)
14 (2/1)
16 (3/1)
18 (3/1)
16 (3/1)
20 (4/1)
16(3/1)
18(3/1)
12(2/1)
8 (1/1)
8 (1/1)
–(An)
Destination
(d 16 , An)
12 (2/1)
12 (2/1)
16 (3/1)
16 (3/1)
18 (3/1)
20 (4/1)
22 (4/1)
20 (4/1)
24 (5/1)
20(4/1)
22(4/1)
16(3/1)
Byte, Word
10 (2/0)
12 (3/0)
10 (2/0)
(d 8 , An, Xn)*
0 (0/0)
0 (0/0)
4 (1/0)
4 (1/0)
6 (1/0)
8 (2/0)
8 (2/0)
8 (2/0)
4 (1/0)
14 (2/1)
14 (2/1)
18 (3/1)
18 (3/1)
20 (3/1)
22 (4/1)
24 (4/1)
22 (4/1)
26 (5/1)
22(4/1)
24(4/1)
18(3/1)
(xxx).W
12 (2/1)
12 (2/1)
16 (3/1)
16 (3/1)
18 (3/1)
20 (4/1)
22 (4/1)
20 (4/1)
24(5/1)
20(4/1)
22(4/1)
16(3/1)
10 (2/0)
12 (3/0)
14 (3/0)
12 (3/0)
16 (4/0)
12 (3/0)
14 (3/0)
0 (0/0)
0 (0/0)
8 (2/0)
8 (2/0)
8 (2/0)
Long
MOTOROLA
(xxx).L
16 (3/1)
16 (3/1)
20 (4/1)
20 (4/1)
22 (4/1)
24 (5/1)
26(5/1)
24(5/1)
28(6/1)
24(5/1)
26(5/1)
20(4/1)