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Using C and a timer to interface 8051 MCUs with UNI/O bus-compatible serial EEPROMs

Posted: 21 May 2008 ?? ?Print Version ?Bookmark and Share

Keywords:MUC? serial EEPROM? I/O pin?

As embedded systems become smaller, a growing need exists to minimize I/O pin usage for communication between devices. Microchip has addressed this need by developing the UNI/O bus, a low-cost, easy-to-implement solution requiring only a single I/O pin for bidirectional communication.

UNI/O bus-compatible serial EEPROMs can be used to enhance any application facing restrictions on available I/O. Such restrictions can potentially stem from connectors, board space or from the MCU itself. The 11XXX family is the newest addition to Microchip Technology's broad serial EEPROM product line, and is compatible with the newly developed UNI/O bus.

The 11XXX family is the newest addition to Microchip Technology's broad serial EEPROM product line, and is compatible with the newly developed UNI/O bus.

Some of the main features of 11XXX serial EEPROMs are:

  • Single I/O pin used for communication
  • EEPROM densities from 1Kbit to 16Kbit
  • Extremely small packages
  • Bus speed from 10kHz up to 100kHz
  • Voltage range from 1.8V to 5.5V
  • Low-power operation
  • Temperature range from -40C to 125C
  • Over 1,000,000 erase/write cycles.

    This application note is part of a series that provide source code to help the user implement the protocol with minimal effort.

    View the PDF document for more information.





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