STMicroelectronics STM32WLEx Reference Manual page 930

Tamper and backup registers (TAMP)
31 Tamper and backup registers (TAMP)
31.1 Introduction
20 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 and 4 internal tampers are available for anti-tamper detection. The
external tamper pins can be configured for edge detection, or level detection with or without
filtering.
31.2 TAMP main features
•
20 backup registers:
–
•
3 external tamper detection events.
–
•
4 internal tamper events.
•
Any tamper detection can generate a RTC timestamp event.
•
Any tamper detection can erase the backup registers, SRAM2 and PKA SRAM.
•
Monotonic counter.
930/1306
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
RM0461 Rev 5
BAT
power is switched off.
RM0461
mode. They