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| Two 7 segment interface in single port of microcontroller |
7 Segments are widely employed displays widely used in embedded applications. It possess many advantages due to its small size, low power consumption and low cost. Before getting started with it read How to interface 7 segment with 8051. But dedicating 7 pins of the microcontroller to it creates a major drawback for it and also the handling capacity of the controller is greatly reduced that is you can only use only four segments along with 8051.
To overcome this you can use the below design where it uses a specific decoder IC 7448 which decodes Binary coded decimal input to proper pattern output to light about the specific LED’s in the 7 segment. Adding this decoder IC along with the 7 segment would allow you to interface a total of 8 seven segments with your 8051 Microcontroller.
PIN DIAGRAM OF 74LS48:
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| IC 7448 |
STEPS TO PROGRAM TWO 7 SEGMENTS IN SINGLE PORT OF 8051 USING DECODER:
- The main advantage of using decoder is there is no need for the user to determine the pattern of illumination of 7 segment.
- You can feed the values directly using your lower four and higher four bits of your microcontroller port.
- Make it to increment one by one by putting it in a for loop.
- You need to shift the increment values from lower four bits to higher four bits for continuous display of numbers in 7 segment.
CODE:
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