RM0453 Rev 1 1041/1461
RM0453 Tamper and backup registers (TAMP)
1057
33 Tamper and backup registers (TAMP)
33.1 Introduction
20 32-bit backup registers are retained in all low-power modes and also in V
BAT
mode. They
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.
33.2 TAMP main features
• 20 backup registers:
– the backup registers (TAMP_BKPxR) are implemented in the RTC domain that
remains powered-on by V
BAT
when the V
DD
power is switched off.
• 3 external tamper detection events.
– External passive tampers with configurable filter and internal pull-up.
• 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.
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