mc68hc916y3 Freescale Semiconductor, Inc, mc68hc916y3 Datasheet - Page 96

• Manufacturer Part Number: mc68hc916y3
• Description: Mc68hc16y3 16 Bit Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

4.10 Execution Model
4-34
MOTOROLA
8-Bit Opcode with 8-Bit Operand
8-Bit Opcode with 4-Bit Index Extensions
8-Bit Opcode, Argument(s)
8-Bit Opcode with 8-Bit Prebyte, No Argument
8-Bit Opcode with 8-Bit Prebyte, Argument(s)
8-Bit Opcode with 20-Bit Argument
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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.
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Opcode
Opcode
Opcode
Opcode
Prebyte
Prebyte
Freescale Semiconductor, Inc.
Figure 4-4 Basic Instruction Formats
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For More Information On This Product,
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Go to: www.freescale.com
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9
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Operand(s)
Operand(s)
Operand(s)
Operand(s)
8
8
8
8
8
8
Operand
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7
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7
X Extension
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6
$0
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5
5
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4
Operand
Operand
Opcode
Opcode
3
3
3
3
3
3
MC68HC16Y3/916Y3
USER’S MANUAL
Y Extension
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2
2
2
2
2
Extension
1
1
1
1
1
1
0
0
0
0
0
0