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Convert 3 4-bit inputs to 12 bits.

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kaupo

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Convert 3 BCD inputs to 12 bits.

Hello

I got 3x4 keypad. I need to convert 3 digit inputs of 0-9 to binary, which will be used to control DAC.
Keypad should be hooked up to decoder (like 74hc922 - 4 parallel output). The question is how to store and convert this 3 BCD (3x 4bit) inputs to 12 bit to control DAC.
 

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