EMBEDDED BINARY CODED DECODER(BCD)

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INTRODUCTION:

  • A binary decoder is that sort of combinational logic that does the  conversion of binary a(n inputs) into maximum 2^n outputs.
  • More frequently implemented as a standalone circuited IC or as an internal part of a multiple IC’s.

One variant of this BCD is the BCD to seven segment decoder. The output will be the corresponding decimal digits 0-9 displayed on the screen.

EXAMPLES OF BCD DECODER IN EMBEDDED SYSTEMS:

A 3 TO 8 line decoder:

  • It activates one of the eight output bits 0 to 7.

A BCD to decimal decoder:

  • It has  has ten output bits.
  • All the output signals are frozen when a non decimal value is inputted to the decoder.

DEMULTIPLEXER:

  • It is a  1-n binary decoder used to divert a input to one of it’s n outputs whilst keeping the other output signals inactive.

CODE TRANSLATOR:

  • Code translators vary where multiple output bits may be active at the same time.
  • An perfect example of this is displaying the digit eight on seven segment via BCD to seven segment decoder.

  • In this unique case all seven segments are lit up (high signal) when the corresponding single input of 0100 is given to the BCD decoder.