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Author: AashiDutt

7 segment/7segment.asm

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+// this is an assembly language code for 7 segment interface with ic 8051
+
+ORG 0000H
+	MOV A,#00H
+	AGAIN: MOV R5,#10    // counter
+	MOV DPTR,#500H       // DPTR data pointer(uses 16 bit register)
+	HERE: MOVC A,@A+DPTR // MOVC = MOVE CONTENT FROM CODE MEMORY TO accumulator
+	// @ means value at address 500H
+	
+	MOV P3,A
+	LCALL DELAY
+	INC DPTR
+	MOV A,#00H
+	DJNZ R5,HERE
+	SJMP AGAIN
+	
+	
+	DELAY:  MOV R0,#07
+	HERE3:MOV R1,#255
+	HERE2:MOV R2,#255
+	HERE1:DJNZ R2,HERE1
+		  DJNZ R1,HERE2
+		  DJNZ R0,HERE3
+	RET
+
+ORG 500H   // FOLLOWING VALUES STORED AT THIS LOCATION
+	DB 3FH,06H,5BH,4FH,66H,6DH,7DH,07H,7FH,67H  //COMMON CATHODE (DISPLAY VALUES FROM 0 TO 9)
+	; DB assembly directive	
+END
+	

7 segment/ckt_&_output.png

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+// This is c code for 7 segment interface with IC -8051 
+
+#include<reg52.h>
+void ms_delay(unsigned int time);
+void main()
+{
+	char DB[]={0x3F,0x06,0x5B,0x4F,0x66,0x6D,0x7D,0x07,0x7F,0x67}; // common cathode
+	unsigned char i;
+	while(1)
+	{                     // code to display 0 to 9 numbers
+		for(i=0;i<10;i++)
+		{
+			P3 =DB[i];   // connected 7 segment to port P3
+			ms_delay(1000);
+		}
+	}
+}
+
+void ms_delay(unsigned int time)
+{
+	unsigned int i,j;
+	// time X 1ms
+	for(i=0;i<time;i++)
+	{
+		for(j=0;j<113;j++);  //1ms
+	 }
+}