MC68HC705CT4 Datasheet, PDF (99/152 Pages) Freescale Semiconductor, Inc – General Release Specification

Freescale Semiconductor, Inc.
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.
MC68HC705CT4 — Rev. 2.0
MOTOROLA
General Release Specification
Comparators
99
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