To Have and to Hold

  • Sid Katzen
Part of the Computer Communications and Networks book series (CCN)


Several mid-and high-range PIC devices feature a small FEPROM scratch-pad memory that can be controlled and accessed indirectly via Special-Purpose Registers (SPRs) in the same manner as other peripheral devices. An integral non-volatile scratchpad enables the programmer to read and modify static data, such as the odometer tally in a car, which needs to be retained in the absence of a power supply — see Example 12.3 on page 349. Although this facility can be implemented using an external EEPROM memory, such as the 24LC01 of Fig. 12.22 on page 350, where only a modest amount of non-volatile data needs to be stored, integral EEPROM storage increases reliability and reduces cost, size and power requirements.


Smart Card Flash Memory Read Cycle Program Store Endless Loop 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

Copyright information

© Springer-Verlag London 2001

Authors and Affiliations

  • Sid Katzen
    • 1
  1. 1.School of Electrical and Mechanical EngineeringUniversity of UlsterNewtownabbey, County AntrimUK

Personalised recommendations