MC68HC908GR4MP datasheet(98/286 Pages) FREESCALE

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Central Processing Unit (CPU)

MC68HC908GR8 • MC68HC908GR4 Data Sheet, Rev. 7

Freescale Semiconductor

Figure 10-1. CPU Registers

10.2.1 Accumulator

The accumulator is a general-purpose 8-bit register. The CPU uses the accumulator to hold operands and

the results of arithmetic/logic operations.

10.2.2 Index Register

The 16-bit index register allows indexed addressing of a 64-Kbyte 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 serve also as a temporary data storage location.

Bit 7

654321

Bit 0

Read:

Write:

Reset:

Unaffected by reset

Figure 10-2. Accumulator (A)

Bit

987654321

Bit

Read:

Write:

Reset:

00000000

XXXXXXXX

X = Indeterminate

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

ACCUMULATOR (A)

INDEX REGISTER (H:X)

STACK POINTER (SP)

PROGRAM COUNTER (PC)

CONDITION CODE REGISTER (CCR)

CARRY/BORROW FLAG

ZERO FLAG

NEGATIVE FLAG

INTERRUPT MASK

HALF-CARRY FLAG

TWO’S COMPLEMENT OVERFLOW FLAG

V1 1 H

N Z C

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