MC68HC705P9CS datasheet(46/160 Pages) FREESCALE

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Central Processor Unit (CPU)

Technical Data

MC68HC705P9 — Rev. 4.0

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

Bit 0

Read:

Write:

Reset:

Unaffected by reset

Figure 4-2. Accumulator (A)

Bit 7

Bit 0

Read:

Write:

Reset:

Unaffected by reset

Figure 4-3. Index Register (X)

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