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MCK68HC16Z1CFC16 Datasheet(PDF) 94 Page - Freescale Semiconductor, Inc

Part No. MCK68HC16Z1CFC16
Description  M68HC16Z Series
Download  500 Pages
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Maker  FREESCALE [Freescale Semiconductor, Inc]
Homepage  http://www.freescale.com
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MCK68HC16Z1CFC16 Datasheet(HTML) 94 Page - Freescale Semiconductor, Inc

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CENTRAL PROCESSING UNIT
M68HC16 Z SERIES
4-34
USER’S MANUAL
Figure 4-4 Basic Instruction Formats
4.10 Execution Model
This description builds up a conceptual model of the mechanism the CPU16 uses to
fetch and execute instructions. The functional divisions in the model do not necessarily
correspond to physical subunits of the microprocessor.
As shown in Figure 4-5, there are three functional blocks involved in fetching, decod-
ing, and executing instructions. These are the microsequencer, the instruction pipe-
line, and the execution unit. These elements function concurrently. All three may be
active at any given time.
8-Bit Opcode with 8-Bit Operand
15
14
13
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11
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9
8
7
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4
3
2
1
0
Opcode
Operand
8-Bit Opcode with 4-Bit Index Extensions
15
14
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9
8
7
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5
4
3
2
1
0
Opcode
X Extension
Y Extension
8-Bit Opcode, Argument(s)
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9
8
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5
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3
2
1
0
Opcode
Operand
Operand(s)
Operand(s)
8-Bit Opcode with 8-Bit Prebyte, No Argument
15
14
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9
8
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3
2
1
0
Prebyte
Opcode
8-Bit Opcode with 8-Bit Prebyte, Argument(s)
15
14
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9
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3
2
1
0
Prebyte
Opcode
Operand(s)
Operand(s)
8-Bit Opcode with 20-Bit Argument
15
14
13
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11
10
9
8
7
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5
4
3
2
1
0
Opcode
$0
Extension
Operand
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com


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