MC68HC05RC17 Datasheet, PDF (47/128 Pages) Freescale Semiconductor, Inc – General Release Specification

Freescale Semiconductor, Inc.
General Release Specification — MC68HC05RC17
Section 5. Resets
5.1 Contents
5.2 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .47
5.3 External Reset (RESET). . . . . . . . . . . . . . . . . . . . . . . . . . . . . .48
5.4 Low-Power External Reset (LPRST) . . . . . . . . . . . . . . . . . . . .50
5.5 Internal Resets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .50
5.5.1 Power-On Reset (POR). . . . . . . . . . . . . . . . . . . . . . . . . . . .50
5.5.2 Computer Operating Properly Reset (COPR) . . . . . . . . . . .51
5.5.2.1 Resetting the COP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .51
5.5.2.2 COP During Wait Mode . . . . . . . . . . . . . . . . . . . . . . . . . .51
5.5.2.3 COP During Stop Mode . . . . . . . . . . . . . . . . . . . . . . . . . .51
5.5.2.4 COP Watchdog Timer Considerations . . . . . . . . . . . . . . .52
5.5.2.5 COP Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .53
5.5.3 Illegal Address. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .53
5.2 Introduction
The MCU can be reset from five sources: two external inputs and three
internal restart conditions. The RESET and LPRST pins are inputs 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 detail.
MC68HC05RC17 — Rev. 2.0
General Release Specification
Resets
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