Microcontroller User's Manual

MOTOROLA Chapter 28. Reset Controller Module 28-1
Chapter 28
Reset Controller Module
The reset controller is provided to determine the cause of reset, assert the appropriate reset
signals to the system, and then to keep a history of what caused the reset. The Low Voltage
Detection module, which generates low-voltage detect (LVD) interrupts and resets, is
implemented within the reset controller module.
28.1 Features
Module features include:
• Seven sources of reset:
— External
— Power-on reset (POR)
— Watchdog timer
— Phase locked-loop (PLL) loss of lock
— PLL loss of clock
— Software
—LVD reset
• Software-assertable RSTO
pin independent of chip reset state
• Software-readable status flags indicating the cause of the last reset
• LVD control and status bits for setup and use of LVD reset or interrupt