MC68HC05V12 Datasheet, PDF (67/246 Pages) Freescale Semiconductor, Inc – HCMOS Microcontreller Unit

Freescale Semiconductor, Inc.
Technical Data — MC68HC05V12
Section 5. Resets
5.1 Contents
5.2 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .67
5.3 External Reset (RESET). . . . . . . . . . . . . . . . . . . . . . . . . . . . . .68
5.4 Internal Resets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .69
5.4.1 Power-On Reset (POR) . . . . . . . . . . . . . . . . . . . . . . . . . . . .69
5.4.2 Computer Operating Properly Reset (COPR) . . . . . . . . . . .70
5.4.2.1 Resetting the COP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .71
5.4.2.2 COP during Wait Mode . . . . . . . . . . . . . . . . . . . . . . . . . .71
5.4.2.3 COP during Stop Mode . . . . . . . . . . . . . . . . . . . . . . . . . .71
5.4.2.4 COP Watchdog Timer Considerations . . . . . . . . . . . . . . .71
5.4.2.5 COP Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .72
5.4.3 Illegal Address Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .73
5.4.4 Disabled STOP Instruction Reset. . . . . . . . . . . . . . . . . . . . .73
5.4.5 Low-Voltage Reset (LVR). . . . . . . . . . . . . . . . . . . . . . . . . . .73
5.4.6 LVR Operation in Stop and Wait Modes . . . . . . . . . . . . . . .74
5.2 Introduction
The MCU can be reset from six sources:
• One external input
• Five internal restart conditions
The RESET pin is an input with a Schmitt trigger as shown in
Figure 5-1. All the internal peripheral modules will be reset by the
internal reset signal (RST). Refer to Figure 5-2 for reset timing details.
MC68HC05V12 — Rev. 2.0
Resets
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Technical Data