ST STM32L4+ Series Reference Manual page 1633

RM0432 Tamper and backup registers (TAMP) applied to STM32L4P5xx and STM32L4Q5xx only
48 Tamper and backup registers (TAMP) applied to
STM32L4P5xx and STM32L4Q5xx only
48.1 Introduction
32 32-bit backup registers are retained in all low-power modes and also in V
can be used to store sensitive data as their content is protected by an tamper detection
circuit. 3 tamper pins are available for anti-tamper detection. The external tamper pins can
be configured for edge detection, or level detection with or without filtering.
48.2 TAMP main features
•
32 backup registers:
–
•
3 external tamper detection events.
–
• Any tamper detection can generate a RTC timestamp event.
•
Any tamper detection can erase the backup registers.
the backup registers (TAMP_BKPxR) are implemented in the RTC domain that
remains powered-on by V
External passive tampers with configurable filter and internal pull-up.
when the V
BAT DD
RM0432 Rev 6
BAT
power is switched off.
mode. They
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