MC68HC08AZ60ACFU MOTOROLA [Motorola, Inc], MC68HC08AZ60ACFU Datasheet - Page 101
MC68HC08AZ60ACFU
Manufacturer Part Number
MC68HC08AZ60ACFU
Description
Microcontrollers
Manufacturer
MOTOROLA [Motorola, Inc]
Datasheet
1.MC68HC08AZ60ACFU.pdf
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7.4.1 Accumulator (A)
7.4.2 Index Register (H:X)
MC68HC08AZ60A — Rev 0.0
MOTOROLA
A
H:X
Reset:
Read:
Write:
Reset:
Read:
Write:
The accumulator is a general-purpose 8-bit register. The CPU uses the
accumulator to hold operands and the results of arithmetic/logic
operations.
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.
X = Indeterminate
Bit
15
0
Bit 7
14
0
Central Processor Unit (CPU)
Figure 7-3. Index Register (H:X)
13
0
Figure 7-2. Accumulator (A)
6
12
0
11
0
5
10
0
Unaffected by reset
9
0
4
8
0
X
7
3
X
6
Central Processor Unit (CPU)
5
X
2
X
4
Advance Information
X
3
1
CPU registers
X
2
X
1
Bit 0
Bit
101
X
0
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