MC68HC705K1 Datasheet, PDF (51/140 Pages) Freescale Semiconductor, Inc – HCMOS Microcontroller Unit

Freescale Semiconductor, Inc.
Technical Data — MC68HC705K1
Section 5. Resets
5.1 Contents
5.3 Reset Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .52
5.3.1 Power-On Reset. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .52
5.3.2 External Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .52
5.3.3 Computer Operating Properly (COP) Reset . . . . . . . . . . . . .54
5.3.4 Illegal Address Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .54
5.3.5 Low-Voltage Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .55
5.4 Reset States . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .55
5.4.1 CPU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .55
5.4.2 I/O Port Registers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .56
5.4.3 Multifunction Timer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .56
5.4.4 COP Watchdog . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .56
5.2 Introduction
This section describes the five reset sources and how they initialize the
microcontroller unit (MCU).
MC68HC705K1 — Rev. 2.0
Resets
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Technical Data