M68ICS08GR datasheet(141/408 Pages) FREESCALE

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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

Read:

Write:

Reset:

Unaffected by reset

Figure 10-2. Accumulator (A)

Bit

8765

4321

Bit

H:X

Read:

Write:

Reset:

000

0000

XXXX

X = Indeterminate

Figure 10-3. Index register (H:X)

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