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MC68HSC705C8ACFS Datasheet(PDF) 45 Page - Freescale Semiconductor, Inc

Part # MC68HSC705C8ACFS
Description  M68HC05 Microcontrollers
PDF  222 Pages
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Manufacturer  FREESCALE [Freescale Semiconductor, Inc]
Direct Link  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

MC68HSC705C8ACFS Datasheet(HTML) 45 Page - Freescale Semiconductor, Inc

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Central Processor Unit (CPU)
CPU Registers
MC68HC705C8A — Rev. 3
Technical Data
MOTOROLA
Central Processor Unit (CPU)
3.3.1 Accumulator
The accumulator (A) shown in Figure 3-2 is a general-purpose 8-bit
register. The CPU uses the accumulator to hold operands and results of
arithmetic and non-arithmetic operations.
Figure 3-2. Accumulator (A)
3.3.2 Index Register
In the indexed addressing modes, the CPU uses the byte in the index
register (X) shown in Figure 3-3 to determine the conditional address of
the operand. See 12.3.5 Indexed, No Offset, 12.3.6 Indexed, 8-Bit
Offset, and 12.3.7 Indexed, 16-Bit Offset for more information on
indexed addressing.
The 8-bit index register also can serve as a temporary data storage
location.
Figure 3-3. Index Register (X)
Bit 7
654321
Bit 0
Read:
Write:
Reset:
Unaffected by reset
Bit 7
654321
Bit 0
Read:
Write:
Reset:
Unaffected by reset
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com



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