Decode Microcontroller Memorizer

Microcontroller decode will normally extract the encrypted firmware from EEPROM, which is more advanced UV EPROM. EEPROM of microcontroller can be decoded and reprogrammed in several hundred or thousands cycles; normally the charge pump on the circuit of microcontroller will generate the high voltage; and very soon the programming process will be completed. The more developed technology for memorizer of microcontroller decode is flash EEPROM, it is the main stream memorizer in the modern microcontroller and smartcard which can provide faster programming time and wipe out the program in block to save the processing time. The microcontroller decode, read and write execution can be performed over ten thousands of time. Most of the modern microcontroller use flash EEPROM as the program memorizer through which the source code can be upgraded on site without the support from expensive programmer.

There is one way to integrate the SRAM & EPROM together which can achieve the fast read/write rate which is non-volatile. But it is very expensive to decode microcontroller and only a few of smartcard and ASIC can use them. Each different kinds of memorizer has its own advantages and drawback, hardware design engineer can decide the selection of microcontroller according to their requirement. Normal microcontroller with the same wafer will choose different memorizer to decode the firmware, such as SRAM and EPROM in the ONE TIME Program microcontroller. SRAM, mask ROM and EEPROM apply on MC68H05 microcontroller decode.

In the CPLD, EPROM, EEPROM & flash EEPROM are all the mainly choices for production, FPGA is mostly based on SRAM, some manufacturer can also provide anti-fuse and flash EEPROM, non-volatile FPGA. Anti-fuse is a special one time programming memorizer, and it can programme the interconnection among metal dies of microcontroller decode. The interconnection is very tiny, approximately 100nm which makes it quite difficult to locate their places, but the anti-fuse technology provide higher security.

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