It generally has 4 input lines and 7 output lines. Mostly these displays are driven by the output stages of digital ICs (to which the visual indication of the output stages has to be performed) such as latches and decade counters, etc.īut these outputs are in the form of 4-bit binary coded decimal (BCD), and not suitable for directly driving the seven-segment displays.Ī display decoder is used to convert a BCD or a binary code into a 7 segment code. However to display the characters and numbers (in order to produce the decimal readout), seven-segment displays are most commonly used. Generally, LCD and LED segments provide the display output of numerical numbers and characters. Most often seven-segment displays are used to display the digits in digital watches, calculators, clocks, measuring instruments and digital counters, etc. Applications of Display Decoder Circuit.7 Segment Display Decoder Circuit Design.
That's a "small" amount of memory for a modest modern microcontroller. Even if you ended up using 32 bits per table entry for convenience, that's still only 1024 bytes of program memory. That would require a minimum of 21 bits per table entry. Or, the table could even result in the 7-segment values for each digit directly. That means a 8-bit in 10-bit out lookup table solves this problem very simply. Since the highest digit can only be 0,1,2, you actually only need 2 bits for its BCD value. The lookup table could result in the 4-bit BCD values for each digit. Since you only have 256 possible input values, it doesn't need to be large. One brute force but simple approach is to use a lookup table. In the special case of the input value only being 0-255, various shortcuts are possible. Note that this works regardless of how large the original number is. The remainder from each division are the digit values in least to most significant order. One way to generate decimal digits is to keep dividing a number by 10. While it is possible to string together enough dedicated digital logic chips to achieve what you want, a microcontroller is the simplest solution for most cases. This could be successively, like counting, or outright dividing. If you want to convert binary to decimal, you're going to have to do a divide in one form or another.
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