4442IC card / Shenzhen IC card processing 4442 IC card Description: 4442 256 byte encryption card, there is read data, write data, protect data, and cryptographic operations. Electrical performance? ● 256 × 8 位 EEPROM? ● byte directly addressed? ● Write Protection bit low address 32 bytes of data provided unrecoverable? ● 32-bit protected-bit? ● writing data marks the end? ● comply 7816-3 Reset standard response time ● byte erase and then write:?? standard value 25ms ● least 10,000 write-erase cycles ● Data retention:? 10 years is widely used in social security, driver management, banks, restaurants and hotels, retail, health insurance, health care, communications, set-top boxes, identification and other areas of IC card. 4442IC Card Function Description: ● three bytes of user passwords. ? ● check the correct password before all the data can only be read, it can not be rewritten. ? ● check the correct password can be changed after the data, including passwords and then inside. ? ● error counter, the initial value of 3, check the error code 1, then subtract 1, if the counter value is 0, then the card is automatically locked, the data can only be read out, can no longer change the password can no longer check; if When non-zero, there is a password verification is correct, restore to the initial value of 3. ? ● write-protected area (first 32 bytes) of each byte can be individually write-protected, be write-protected content can not be changed (ie curing data). Programmer's Note: 1. Remove the write-protected area of ??32 bytes, only 224 bytes operable programmer, write-protected area, such as the opportunity to write only once, generally do not use. 2. Note that each rewrite password, only the next card after power-on password to take effect. 3. The password is 3 bytes is 24 bits, generally ambassador password '255255255', converted to hexadecimal six F That 'FFFFFF' Shenzhen City Bank Trade Smart Card Co. ___4442IC card / IC card processing Shenzhen