CHAPTER 3: Clock Supervisor
140 FM4 Peripheral Manual, Doc. No. 002-04856 Rev. *E
1. Overview
This section provides an overview of the clock supervisor functions.
The clock supervisor includes the following two types of functions.
Clock failure detection (CSV: Clock failure detection by clock Supervisor)
The clock failure detection monitors the main and sub clocks. If a rising edge of the monitored clock is not
detected within the specified period, this function determines that the oscillator has failed, and outputs a
system reset request.
Anomalous frequency detection (FCS: anomalous Frequency detection by Clock Supervisor)
The anomalous frequency detection monitors frequency of the main clock. Within the specified period
between an edge and the next edge of the divided clock of high-speed CR, this function counts up the
internal counter value using the main clock. If the count value reaches out of the set window range, the
function determines that the main clock frequency is anomalous, and outputs an interrupt request to the
CPU or a system reset request.
To Next Page
Loading...
