Compactor of BCD and magnitude
The Compactor of BCD and magnitude have previously shown the T-type flip flops has used as separate counters. If we link multiple toggles flops in a chain, a digital counter has produced which stores or shows the number of times a sequence of counts are present.
Clocked T-type flops are the binary counter-part-by-two and asynchronous counters; for the next stage, the contribution of one counting stage provides the pulse clock. So there are two different performance statuses of a flip flop counter. We can build a split by 2N counter by adding more flip flop levels. But the issue is that it counts between 0000 and 1111 for 4-bit binary counters. It’s in the decimal between 0 and 15.
In order to create a digital counter that ranges from 1 to 10. Only binary numbers 0000 to 1001 need to count. That’s from 0 to 9 decimal places and luckily we can count circuits with an Asynchronous 74LS90 integrated circuit.
Decade Counter.
When applying a clock signal, digital counters count upward from zero to a predetermined count. Until the count has reached, reset the counter to zero and restart it.
At the count of nine, a ten-year clock counts and then returns to zero. The counter must, of course, have at least four flip flops within the chain to count up to a binary value of nine to reflect each decimal digit as seen.
There are then four twist counters, with 16 possible states and 10 of them, and we can count to 100 or 1,000 or whatever the final number we want if we link a set of counters together.
It has called the Limit, which counts that a clock should also count. A counter returning to n has called a modulo-n counter, e.g. a modulo-8 (MOD-8) or a modulo-16 (MOD-16) counter, etc., and the maximum range for an n-bits counter is from 0 to 2n-1.
However, as we saw in the Asynchronous Counter tutorial, a counter that resets after 10 counts from binary 0000 (decimo “0”) to 1001 (decimal “9”) with a divided-by-10 count sequence can be called a “binary-coded-decimal counter” or a MOD-10 counter, using at least 4 toggles, can be created.
BCD counter
It is called a BCD counter since, unlike a straight binary counter, its ten state sequences are BCD and do not have a normal pattern. Then a single BCD counter, like the 74LS90, counts from the decimal zero to the decimal nine and can register up to nine pulses. Note that based on an input control signal, a digital counter will count or count up or down.
Binary-coded-decimal coding is an 8421 code of four binary numbers. The designation 8421 refers to the four digits or bits of binary weight used. 23 = 8, 22 = 4, 21 = 2 and 20 = 1. For example. The key benefit of BCD coding is that it makes it easier to convert decimal and binary numbers.