MC68HC705C Motorola, MC68HC705C Datasheet - Page 43

• Manufacturer Part Number: MC68HC705C
• Description: HCMOS Microcontroller Unit
• Manufacturer: Motorola

3.3.1 Accumulator
3.3.2 Index Register
MC68HC705C8A — Rev. 2.0
MOTOROLA
The accumulator (A) shown in
register. The CPU uses the accumulator to hold operands and results of
arithmetic and non-arithmetic operations.
Reset:
In the indexed addressing modes, the CPU uses the byte in the index
register (X) shown in
the operand. See
Offset, and
indexed addressing.
The 8-bit index register also can serve as a temporary data storage
location.
Reset:
Read:
Read:
Write:
Write:
Bit 7
Bit 7
Central Processor Unit (CPU)
12.3.7 Indexed, 16-Bit Offset
6
6
12.3.5 Indexed, No
Figure 3-3. Index Register (X)
Figure 3-2. Accumulator (A)
Figure 3-3
5
5
Figure 3-2
Unaffected by reset
Unaffected by reset
to determine the conditional address of
4
4
Offset,
3
3
is a general-purpose 8-bit
for more information on
12.3.6 Indexed, 8-Bit
Central Processor Unit (CPU)
2
2
1
1
CPU Registers
Technical Data
Bit 0
Bit 0
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