Programming Example Circuit

灞波儿奔

Programming Example Circuit [Copy link]

CPU cards are generally used in conjunction with ESAM modules (embedded security control modules), so there is no need to say much about the role of CPU cards. ESAM modules are generally soldered on the circuit board together with the single-chip microcomputer. In fact, the ESAM module can be regarded as a CPU card fixed on the circuit board. Its role and function are basically the same as those of the CPU card, and it can also be used as a storage medium for money and important data. The technical requirements for the safety certification card (module) of the Ministry of Construction stipulate that the security certification of the CPU card system is completed by the CPU card and the ESAM module. The single-chip microcomputer only plays a role in communication transmission, and there is no need to add the encryption algorithm DES. As shown in the figure below, it is the overall block diagram of the hardware circuit of the CPU card reading and writing using the MSP430 single-chip microcomputer. The IC card circuit and ESAM interface circuit are the focus of our next study. The crystal oscillator circuit provides a stable clock signal for the entire single-chip microcomputer circuit system. The timing requirements during the CPU card reading and writing process are very strict, so the crystal circuit must ensure that it can provide a stable clock for the entire single-chip microcomputer system. The LCD circuit is used as a human-computer interaction interface to display relevant information during the CPU card reading and writing process. The JTAG interface is essential for debugging. By connecting the emulator to the computer, simulation debugging can be achieved in the IAR environment.