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M68ICS08GR датащи(PDF) 141 Page - Freescale Semiconductor, Inc

номер детали M68ICS08GR
подробное описание детали  M68HC08 Microcontrollers
PDF  408 Pages
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производитель  FREESCALE [Freescale Semiconductor, Inc]
домашняя страница  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

M68ICS08GR датащи(HTML) 141 Page - Freescale Semiconductor, Inc

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Central Processing Unit (CPU)
CPU registers
MC68HC908GR8 — Rev 4.0
Technical Data
MOTOROLA
Central Processing Unit (CPU)
141
10.4.1 Accumulator (A)
The accumulator is a general-purpose 8-bit register. The CPU uses the
accumulator to hold operands and the results of arithmetic/logic
operations.
10.4.2 Index register (H:X)
The 16-bit index register allows indexed addressing of a 64K byte
memory space. H is the upper byte of the index register and X is the
lower byte. H:X is the concatenated 16-bit index register.
In the indexed addressing modes, the CPU uses the contents of the
index register to determine the conditional address of the operand.
The index register can also be used as a temporary data storage
location.
Bit 7
654321
Bit 0
A
Read:
Write:
Reset:
Unaffected by reset
Figure 10-2. Accumulator (A)
Bit
15
14
13
12
11
10
9
8765
4321
Bit
0
H:X
Read:
Write:
Reset:
000
0000
0
XXXX
XXXX
X = Indeterminate
Figure 10-3. Index register (H:X)
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com



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