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MC68HC705P9CS датащи(PDF) 46 Page - Freescale Semiconductor, Inc

номер детали MC68HC705P9CS
подробное описание детали  Microcontrollers
PDF  160 Pages
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производитель  FREESCALE [Freescale Semiconductor, Inc]
домашняя страница  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

MC68HC705P9CS датащи(HTML) 46 Page - Freescale Semiconductor, Inc

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Central Processor Unit (CPU)
Technical Data
MC68HC705P9 — Rev. 4.0
46
Central Processor Unit (CPU)
MOTOROLA
4.6 CPU Registers
The M68HC05 CPU contains five registers that control and monitor MCU
operation:
•
Accumulator
•
Index register
•
Stack pointer
•
Program counter
•
Condition code register
CPU registers are not memory mapped.
4.6.1 Accumulator
The accumulator is a general-purpose 8-bit register. The CPU uses the
accumulator to hold operands and the results of arithmetic and logic
operations.
4.6.2 Index Register
The index register can be used for data storage or as a counter. In the
indexed addressing modes, the CPU uses the byte in the index register
to determine the effective address of the operand.
Bit 7
6
54
32
1
Bit 0
Read:
Write:
Reset:
Unaffected by reset
Figure 4-2. Accumulator (A)
Bit 7
6
54
32
1
Bit 0
Read:
Write:
Reset:
Unaffected by reset
Figure 4-3. Index Register (X)
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com



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