MC68HC908MR8 Datasheet, PDF (327/372 Pages) Motorola, Inc – Microcontrollers

Technical Data — MC68HC908MR8
Section 19. Power-On Reset (POR)
19.1 Contents
19.2 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .327
19.3 Functional Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . .327
19.2 Introduction
This section describes the power-on reset (POR) module.
19.3 Functional Description
The POR module provides a known, stable signal to the MCU at
power-on. This signal tracks V_DD until the MCU generates a feedback
signal to indicate that it is properly initialized. At this time, the POR drives
its output low. The POR is not a brown-out detector, low-voltage
detector, or glitch detector. V_DD at the POR must go completely to 0 to
reset the MCU. To detect power-loss conditions, use a low-voltage
inhibit module (LVI) or other suitable circuit.
MC68HC908MR8 — Rev 4.1
Freescale Semiconductor
Power-On Reset (POR)
Technical Data
327