MC68HC05P18A Datasheet, PDF (45/130 Pages) Freescale Semiconductor, Inc – HCMOS Microcontroller Unit

Freescale Semiconductor, Inc.
Technical Data — MC68HC05P18A
Section 5. Resets
5.1 Contents
5.2 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45
5.3 External Reset (RESET). . . . . . . . . . . . . . . . . . . . . . . . . . . . . .46
5.4 Internal Resets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .46
5.4.1 Power-On Reset (POR) . . . . . . . . . . . . . . . . . . . . . . . . . . . .47
5.4.2 Computer Operating Properly (COP) Reset . . . . . . . . . . . . .47
5.4.3 Low-Voltage Reset (LVR). . . . . . . . . . . . . . . . . . . . . . . . . . .48
5.2 Introduction
The MCU can be reset from four sources:
• One external input
• Three internal reset conditions
The RESET pin is an input with a Schmitt trigger as shown in
Figure 5-1. The CPU and all peripheral modules are reset by the internal
reset signal (RST), which is the logical OR of internal reset functions and
is clocked by PH2.
MC68HC05P18A
Resets
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Technical Data