HC705P6AGRSSLASHD datasheet(77/134 Pages) NXP

77 / 134 page

MC68HC705P6A — Rev. 1.0

General Release Specification

Analog Subsystem

General Release Specification — MC68HC705P6A

Section 9. Analog Subsystem

9.1 Contents

9.2

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .77

9.3

Analog Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .78

9.3.1

Ratiometric Conversion . . . . . . . . . . . . . . . . . . . . . . . . . . . .78

9.3.2

Reference Voltage (VREFH) . . . . . . . . . . . . . . . . . . . . . . . . .78

9.3.3

Accuracy and Precision. . . . . . . . . . . . . . . . . . . . . . . . . . . .78

9.4

Conversion Process . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .78

9.5

Digital Section. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .79

9.5.1

Conversion Times . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .79

9.5.2

Internal versus External Oscillator. . . . . . . . . . . . . . . . . . . .79

9.5.3

Multi-Channel Operation . . . . . . . . . . . . . . . . . . . . . . . . . . .79

9.6

A/D Status and Control Register (ADSC) . . . . . . . . . . . . . . . . .80

9.7

A/D Conversion Data Register (ADC). . . . . . . . . . . . . . . . . . . .82

9.8

A/D Subsystem Operation during Halt/Wait Modes . . . . . . . . .82

9.9

A/D Subsystem Operation during Stop Mode. . . . . . . . . . . . . .82

9.2 Introduction

The MC68HC705P6A includes a 4-channel, multiplexed input, 8-bit,

successive approximation A/D converter. The A/D subsystem shares its

inputs with port C pins PC3–PC7.

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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