BCD switsch

[mbessler]

Original geschrieben von fmw
Hi

I will build a display with use of a BCD switsch.

Can anybody explamin me the function of the BCD.

Ther is more type of the BCD, decimal and hex.

How is it function and how are you connect it to the FSKEY

Regards

Finn
Denmark

BCD stands for Binary Coded Decimal.

It basically means that you code the decimal system in a binary means.
eg. for each digit in your decimal number, you use 4 bits binary.
This looks like this:

decimal
 number  |  BCD
      0  |      0000
      1  |      0001
      2  |      0010
      3  |      0011
      4  |      0100
      5  |      0101
      6  |      0110
      7  |      0111
      8  |      1000
      9  |      1001
     10  | 0001 0000
     11  | 0001 0001
     ...
     20  | 0010 0000
     21  | 0010 0001
     ...
    123  |    0001 0010 0011

Hope it helps.