HC705JJ7GRSSLASHD datasheet(103/230 Pages) NXP

103 / 230 page

MC68HC705JJ7/MC68HC705JP7 — Rev. 3.0

General Release Specification

Analog Subsystem

General Release Specification — MC68HC705JJ7/MC68HC705JP7

Section 8. Analog Subsystem

8.1 Contents

8.2

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .104

8.3

Analog Multiplex Register . . . . . . . . . . . . . . . . . . . . . . . . . . . .106

8.4

Analog Control Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . .111

8.5

Analog Status Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .115

8.6

A/D Conversion Methods . . . . . . . . . . . . . . . . . . . . . . . . . . . .118

8.7

Voltage Measurement Methods . . . . . . . . . . . . . . . . . . . . . . .128

8.7.1

Absolute Voltage Readings . . . . . . . . . . . . . . . . . . . . . . . .129

8.7.1.1

Internal Absolute Reference. . . . . . . . . . . . . . . . . . . . . .129

8.7.1.2

External Absolute Reference . . . . . . . . . . . . . . . . . . . . .130

8.7.2

Ratiometric Voltage Readings. . . . . . . . . . . . . . . . . . . . . .131

8.7.2.1

Internal Ratiometric Reference . . . . . . . . . . . . . . . . . . .131

8.7.2.2

External Ratiometric Reference . . . . . . . . . . . . . . . . . . .131

8.8

Voltage Comparator Features . . . . . . . . . . . . . . . . . . . . . . . .133

8.8.1

Voltage Comparator 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . .133

8.8.2

Voltage Comparator 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . .134

8.9

Current Source Features . . . . . . . . . . . . . . . . . . . . . . . . . . . .134

8.10

Internal Temperature Sensing Diode Features. . . . . . . . . . . .134

8.11

Sample and Hold . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .134

8.12

Port B Interaction with Analog Inputs . . . . . . . . . . . . . . . . . . .135

8.13

Port B Pins As Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .135

8.14

Port B Pulldowns . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .136

8.15

Noise Sensitivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .136

Freescale Semiconductor, Inc.

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HC705JJ7GRS/D Datasheet(PDF) 103 Page - NXP Semiconductors

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