HC705P6AGRSSLASHD datasheet(96/134 Pages) NXP

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CPU Core

General Release Specification

MC68HC705P6A — Rev. 1.0

CPU Core

Figure 12-1. MC68HC05 Programming Model

12.3.1 Accumulator

The accumulator is a general-purpose 8-bit register as shown in

Figure 12-1. The CPU uses the accumulator to hold operands and

results of arithmetic calculations or non-arithmetic operations. The

accumulator is unaffected by a reset of the device.

12.3.2 Index Register

The index register shown in Figure 12-1 is an 8-bit register that can

perform two functions:

•

Indexed addressing

•

Temporary storage

In indexed addressing with no offset, the index register contains the low

byte of the operand address, and the high byte is assumed to be $00. In

indexed addressing with an 8-bit offset, the CPU finds the operand

address by adding the index register contents to an 8-bit immediate

value. In indexed addressing with a 16-bit offset, the CPU finds the

CONDITION CODE REGISTER

ACCUMULATOR

INDEX REGISTER

STACK POINTER

111

PROGRAM COUNTER

HALF-CARRY BIT (FROM BIT 3)

INTERRUPT MASK

NEGATIVE BIT

ZERO BIT

CARRY BIT

Freescale Semiconductor, Inc.

For More Information On This Product,

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