HC705JJ7GRSSLASHD datasheet(40/230 Pages) NXP

Part #	HC705JJ7GRS/D

Description	Low-Cost, HC05 Core MCU in 20-Pin Package (MC68HC705JJ7) or 28-Pin Package (MC68HC705JP7)

PDF	230 Pages

Scroll/Zoom	100%

Manufacturer	NXP [NXP Semiconductors]

Direct Link	http://www.nxp.com

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40 / 230 page

Central Processor Unit (CPU)

General Release Specification

MC68HC705JJ7/MC68HC705JP7 — Rev. 3.0

Central Processor Unit (CPU)

3.2 Introduction

This section describes the CPU registers. Figure 3-1 shows the five

CPU registers. CPU registers are not part of the memory map.

Figure 3-1. 68HC05 Programming Model

3.3 Accumulator (A)

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

3-2. The CPU uses the accumulator to hold operands and results of

arithmetic and non-arithmetic operations.

ACCUMULATOR (A)

INDEX REGISTER (X)

PCL

PCH

CONDITION CODE REGISTER (CCR)

PROGRAM COUNTER (PC)

STACK POINTER (SP)

HALF-CARRY FLAG

INTERRUPT MASK

NEGATIVE FLAG

ZERO FLAG

CARRY/BORROW FLAG

Bit 7

654321

Bit 0

Read:

Write:

Reset:

Unaffected by Reset

Figure 3-2. Accumulator (A)

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

HC705JJ7GRS/D Datasheet(PDF) 40 Page - NXP Semiconductors