|GCSE Sequential Logic >BCD Counting< D Type Flip Flop D Type Latch Decade Counter Sequencer Up Counter|
Sequential Logic BCD Counting
BCD stands for Binary Coded Decimal
There is more information here.
This table shows the binary numbers from 0 to 9 in columns D0, D1, D2 and D3.
The columns A to G show which display segments should be lit for each digit.
To show an eight, all the segments must be lit so the binary is 1111111.
To show a zero, all except for G must be lit so the binary is 0111111.
A typical exam question has a table like this one with some blank rows that you have to fill in.
This is a common cathode display and it needs a high level to light each LED. Common anode displays need a low level.
Subject Name Level Topic Name Question Heading First Name Last Name Class ID User ID
Q: qNum of last_q Q ID: Question ID Score: num correct/num attempts Date Done
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