scan signal from C0 to C3 into the signal in order of 1000-gt; 0100- gt; 0010- gt; 0001- gt; 1000 cycle, when the scanning signal to 1000, then scanning 0 line of four keys. Scanning signal for 0100, then scanning resolution a line of four buttons, and so on. if a button is pressed, R3 ~ R0 the output signal will be one to one, but we are unable to confirm which a key is pressed, we must proceed from R3 ~ R0 with the output signal of C0 to C3

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....\bcd_bin2.acf
....\bcd_bin2.fit
....\bcd_bin2.hex
....\bcd_bin2.hif
....\bcd_bin2.mmf
....\bcd_bin2.ndb
....\bcd_bin2.pin
....\bcd_bin2.pof
....\bcd_bin2.rpt
....\bcd_bin2.snf
....\bcd_bin2.sof
....\BCD_BIN2.sym
....\bcd_bin2.ttf
....\bcd_bin2.vhd

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