When the key “d” is entered, the
firmware turns off the SLCD, disables the tamer detection, and starts reading the
RWW EEPROM section
The terminal window will display the
history of tamper occurred as shown in the following figure
Figure 6-13. Terminal Window when
Tamper History Read
When the tamper history is displayed,
the firmware will reconfigure the tamper in the previous mode in which it was
operating
The tracking of previous mode is done
by previous mode flag as mentioned in the sections WAKE Mode and CAPTURE Mode
As this memory is non-volatile, it
will retain the value even after power reset. The first two bytes of the EEPROM
emulated area contains the number of tampers occurred.
The EEPROM emulated area of
SAML22N18A is approx. 8KB. Here, the firmware is capable of writing 128 entries of
tamper, that means it utilizes 898 bytes of RWW EEPROM emulated area for recording
tamper occurrence. After writing the 128th entry, the firmware will
provide a warning that this is the last memory of EEPROM area and clean the memory,
as shown in the Figure 6-12. The next tamper entry will not be recorded by the
firmware until the user erases the RWW EEPROM memory.
However, the tamper will be detected
and displayed in respective screens, but will not be stored in memory
Note: As the tamper detection is
disabled during the tamper history read operation the tamper conditions will
not be detected until the tamper history read operation is completed.
The online versions of the documents are provided as a courtesy. Verify all content and data in the device’s PDF documentation found on the device product page.
