6.2.4 Clock monitoring
Clocks in the WCT101xS are supervised by clock monitor units.
• System PLL clock monitor: monitors the loss of PLL clock
• System Oscillator (SOSC) clock monitor: monitors the loss of oscillator clock
References:
• Functional description: in this Reference Manual, see
• Clock monitoring in safety concept: see Safety Manual chapter
6.2.5 Temporal protection
In a safety concept, watchdog timers provide temporal protection and monitor the
operation of the system by expecting periodic communication from the software.
WCT101xS offers two watchdog timers:
• Watchdog timer (WDOG): An independent timer that is available for system use. It
provides a safety feature to ensure that software is executing as planned and that the
CPU is not stuck in an infinite loop.
• External Watchdog Monitor (EWM): A redundant watchdog system for safety. The
EWM provides an independent output signal. It does not reset the MCU and
peripherals.
References:
• Functional description: in this Reference Manual, see
and
• Temporal protection in safety concept: see Safety Manual chapter
6.2.6 Operational interference protection
WCT101xS provides safety mechanisms to:
• prevent non-safety masters from interfering with the operation of the Safety Core
• manage the concurrent execution of software with different (lower) ASIL
A hierarchical memory protection scheme, which includes the following, protects against
interference:
• System Memory Protection Unit (MPU)
• Peripheral Bridge (AIPS-Lite)
• Register protection
Chapter 6 Safety Overview
MWCT101xS Series Reference Manual, Rev. 3, 07/2019
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