HC705CT4GRSSLASHD datasheet(99/152 Pages) NXP

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MC68HC705CT4 — Rev. 2.0

General Release Specification

MOTOROLA

Comparators

General Release Specification — MC68HC705CT4

Section 13. Comparators

13.1 Contents

13.2

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .99

13.3

Comparator Control/Status Register. . . . . . . . . . . . . . . . . . . .101

13.4

Reading Comparator Outputs. . . . . . . . . . . . . . . . . . . . . . . . .103

13.5

Comparator During Wait Mode . . . . . . . . . . . . . . . . . . . . . . . .103

13.6

Comparator During Stop Mode. . . . . . . . . . . . . . . . . . . . . . . .103

13.7

Comparator Power Supply Source . . . . . . . . . . . . . . . . . . . . .103

13.2 Introduction

Port D shares its pins with CMP3+/PD0, CMP1–/PD1 and

CMP12+/PD2, CMP2–/PD3 of the comparators. The output of the

comparators is a status bit internal to the MCU. This circuitry is used for

the comparison of analog signals, with a digital output. The comparator

circuitry may be powered up by setting the CEN1, CEN2, and the CEN3

bits in the comparator control/status register. This register is located at

$0022 and is cleared by reset. The state of the comparator output bit

upon RESET is logic 0. For further electrical information see Section 17.

Electrical Specifications.

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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