Question 6.7: (a) Write a program to get hex data in the range of 00 – FFH...
(a) Write a program to get hex data in the range of 00 – FFH from port 1 and convert it to decimal. Save it in R7, R6 and R5.
(b) Assuming that P1 has a value of FDH for data, analyze program.
(a)
| MOV A,#0FFH MOV P1,A ;make P1 an input port MOV A,P1 ;read data from P1 MOV B,#10 ;B=0A hex DIV AB ;divide by 10 MOV R7,B ;save lower digit MOV B,#10 DIV AB ;divide by 10 once more MOV R6,B ;save the next digit MOV R5,A ;save the last digit |
(b) To convert a binary (hex) value to decimal, we divide it by 10 repeatedly until the quotient is less than 10. After each division the
remainder is saves.
Q R
FD/0A = 19 3 (low digit)
19/0A = 2 5 (middle digit)
2 (high digit)
Therefore, we have FDH=253.
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