![]() The input pins may be used to connect to switches on a decimal keypad, and the encoder would output a 4-bit BCD code, 2 to 2 depending on which key has been pressed, or simply to identify which one of ten input lines in a circuit is active, by outputting an appropriate number in four bit BCD code. Typical applications include sequence generating for lamp control, row scanning for dot matrix displays, digital operation of analogue controls and anywhere that a sequence of unique outputs is required. ![]() ![]() This is a one nibble memory for the 4 bit BCD input controlled by a Latch Enable LE pin, which allows the decoder to store the 4 bit input present, when LE is logic 0 so that only the stored data is displayed. ![]() To overcome common problems such as these, a more complex circuit or IC is required. #Decimal to bcd priority encoder pdf pdf. ![]()
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