Department of Electronic & Electrical Engineering Seven segment display Subroutines.

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Presentation transcript:

Department of Electronic & Electrical Engineering Seven segment display Subroutines.

Department of Electronic & Electrical Engineering Seven Segment LED Display

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Department of Electronic & Electrical Engineering Binary  seven segment display ● We have 4 bits of input (hex number). ● We want to display the corresponding character on the 7seg display. ● Each segment can be represented by a bit of a binary number. ● The problem is to lookup the correct 7seg code for each 4bit number. ● This can be done using a lookup table.

Department of Electronic & Electrical Engineering

Lookup table using programmed return. ; setup stuff here..... ; w contains the 4 bit number movlw 4,w call conversion ; w now contains the 7 segment code ;....more stuff here ; convert 4bit number in w into a seven segment code. conversion: ; this is just a label for the assembler addwf PCL ; add w to the PC (jump) retlw B' ' ; 0 return 7 seg code. retlw B' ' ; 1 retlw B' ' ; 2 retlw B' ' ; 3 retlw B' ' ; 4