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The principle of the SIM card
Jan 03, 2018

The SIM card is a chip with a microprocessor,

There are 5 modules, each module corresponds to a function:

CPU (8-bit/16-bit/32-bit), program memory ROM, working memory RAM, data memory EEPROM and serial communication unit, 5 modules integrated into an integrated circuit. The SIM card requires a minimum of 5 connectors when connecting to the phone:

* Power (VCC) * Clock (CLK) * data I/O port (database) * Reset (RST) * Ground End (GND)

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