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DS2432解密——DALLAS解密

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    关于DS2432单片机:
  The DS2432 combines 1024 bits of EEPROM, a 64-bit secret, an 8-byte register/control page with up to 5 user read/write bytes, a 512-bit SHA-1 engine and a fully-featured 1-Wire interface in a single chip.Data is transferred serially via the 1-Wire protocol,which requires only a single data lead and a ground return. The DS2432 has an additional memory area called the scratchpad that acts as a buffer when writing to the main memory , the register page or when installing a new secret.Data is first written to the scratchpad from where it can be read back.
  DS2432 FEATURES:
  •On-chip 512-bit SHA-1 engine to compute 160-bit Message Authentication Codes (MAC) and to generate secrets
  •Write access requires knowledge of the secret and the capability of computing and transmitting a 160-bit MAC as authorization
  •Secret and data memory can be write-protected (all or page 0 only) or put in EPROMemulation mode (“write to 0”, page 1)
  •Unique, factory-lasered and tested 64-bit registration number assures absolute traceability because no two parts are alike
  •Built-in multidrop controller ensures compatibility with other 1-Wire net products
  •Reduces control, address, data and power to a single data pin
  •Directly connects to a single port pin of a microprocessor and communicates at up to 16.3k bits per second
  •Overdrive mode boosts communication speed to 142k bits per second
  •Low cost 6-lead TSOC surface mount package,or solder-bumped Flipchip package
  •Reads and writes over a wide voltage range of 2.8V to 5.25V from -40°C to +85°C