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07/13/12 22:35
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#187930 - Master Code
Responding to: Per Westermark's previous message
Sine I am designing around PIC which has a built in EEPROM, so it also required to store a checksum/CRC byte to internal EEPROM or only four digit code sufficient?
In this system there will be two code, one is user code and second is master code. Both the codes are of four digits. If user code is forgotten then by master code person can open a safe.

I want to know since PIC has a inbuilt EEPROM so still in this case checksum/CRC is necessary or without it.

For development purpose I am using PIC16F886 which is 28 pin device but for final I will use low pin count PIC like PIC16F690.

List of 13 messages in thread
Password in EEPROM      Arif Deshmukh      07/13/12 17:29      
   Checksum      Per Westermark      07/13/12 21:29      
      8-digit code      Per Westermark      07/13/12 21:36      
         Master Code      Arif Deshmukh      07/13/12 22:35      
            So what does the requirements spec say?      Per Westermark      07/13/12 22:47      
            master codes ....      Erik Malund      07/14/12 01:12      
               This is a low-security lock - or no measly 4-digit PIN      Per Westermark      07/14/12 01:18      
                  language      Erik Malund      07/14/12 08:48      
                     just a thought      Erik Malund      07/14/12 09:09      
                        Never give access when locked      Per Westermark      07/14/12 10:14      
                     PIN + PUK      Per Westermark      07/14/12 10:11      
   The eeprom doesnt hold the password      Jez Smith      07/14/12 19:57      
      High/low security        Per Westermark      07/14/12 23:10      

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