6 results about "EEPROM" patented technology

In a remote control system having a transmitter and a receiver, a rolling code is ciphered to generate a ciphered rolling code by repeating, n times, an exclusive-OR operation on a constant code in a rolling code table and the rolling code as well as an-maximum shift keying. A key code specific to each control system is used as a constant code at the k-th exclusive-OR logic operation so that the k-th exclusive-OR logic operation becomes different from system to system resulting in different ciphering method for each system. The key code is set in an EEPROM in the process of control system production so that the rolling code may not be deciphered even by a design engineer as long as the key code is kept undisclosed.

The invention relates to a booster circuit and method for improving the programming accuracy of an EEPROM. The booster circuit comprises a register, an MOS tube switch array, a reference source, a charge pump and the EEPROM. The booster circuit fully utilizes the characteristic that the data of the EEPROM memorizer can be saved for enough long time when a chip is powered down to specially mark out a small part of an EEPROM storage area as a special correction area. The booster circuit has the advantages that a common register is firstly used for adjusting the accuracy of the booster circuit in a chip testing mode, the EEPROM can perform normal programming and stores the data in the register in the EEPROM special correction area when an accurate booster circuit voltage value is obtained. The booster circuit occupies small chip area and is low in cost. In addition, the register in the circuit can be repeated scanned, the digit can be corrected to be higher, and the correction accuracy is high.

The invention discloses a satellite-borne DSP program external boot loading method and loading system and relates to a DSP program loading technology. According to an existing DSP program loading method, a program memory must be smaller than an internal RAM memory of a DSP; and if a hardware circuit or FPGA sequential logic related to external guidance fails, the guidance process fails, the DSP cannot work, and the like, the system is formed by sequentially connecting the DSP, the FPGA andan EEPROM. Wherein three parts of secondary bootloader programs are stored in the EEPROM; the FPGA servesas the key of DSP guiding loading two-out-of-three, an SPI communication protocol is achieved, the FPGA communicates with the DSP and the EEPROM, and two-out-of-three verification is conducted on three pieces of two-stage bootloader program data in the EEPROM according to bits. According to the guiding method, the internal guiding function and the external guiding function are achieved at the sametime, faults of external guiding circuit hardware or FPGA programs are prevented, the guiding modes of the remote control instructions can be flexibly switched through the FPGA, and normal operationof the user programs is guaranteed.

A method of verifying the atomicity of an operation of data update in an EEPROM, includes, during a data writing operation of writing the data, the steps of: initializing at least one first flag to a first value and storing this value in the EEPROM; erasing the data from the EEPROM; writing a value of the data into the EEPROM; and writing at least one second value of the first flag into the EEPROM.

The invention discloses an industrial electronic lock which comprises a front panel, a main body and a rear panel. A magnet and an input contact are arranged on the front panel, the main body comprises a CPU system, an EEPROM storage chip, a FLASH chip, a relay module, a logic level module and a communication module, and the rear panel comprises a power supply module and a function output module.The input contact, the EEPROM storage chip, the FLASH chip, the relay module, the logic level module and the communication module are respectively connected with the CPU system, the relay module, thelogic level module and the communication module are respectively connected with the function output module, and the power supply module supplies power to the CPU system, the EEPROM storage chip, the FLASH chip, the relay module, the logic level module and the communication module. The industrial electronic lock can realize the personnel identity recognition, authority management and operation behavior recording functions, and guarantees the safety of an industrial field.