Question
Which of the following ideas would most likely be the most useful in converting a value ranging from 0 to 99 stored in hexidecimal/binary of
Which of the following ideas would most likely be the most useful in converting a value ranging from 0 to 99 stored in hexidecimal/binary of an embedded controller to a displayable decimal number for a human to visualize on two 7 segment LED displays, such as TIL311s or typical seven segment displays controlled by a 7447 or 7448 decoder?
Question options:
| Take the hexidecimal (or binary) number residing in a particular RAM register and perform multiple additions to itself in a loop 4 times. And then take the result and subtract 6 which can then be readily sent to a full eight bit port for displaying the BCD answer. If the loop takes more than 1 second, be sure to blank out the most significant tens place display. |
| Take the hexidecimal (or binary) number residing in a particular RAM register and perform a rotation to the left 5 times. And then take the result and subtract 5 which can then be readily sent to a full eight bit port for displaying the BCD answer. If the rotational value is 0, be sure to blank out the most significant tens place display. |
| Take the hexidecimal (or binary) number residing in a particular RAM register and place it on the stack with a push command. And then subtract the value of 12 (or 0x0C) from the original RAM value and and then add the result to the value stored on the stack with a pop command which can then be readily sent to a full eight bit port for displaying the BCD answer. If the stack value is 0, be sure to blank out the most significant tens place display. |
| Take the hexidecimal (or binary) number residing in a particular RAM register and perform multiple subtractions to itself in a loop until the carry flag is activated. And then take the result and add 10 (or 0x0A) which can then be readily sent to a full eight bit port for displaying the BCD answer. If the loop does not produce a carry flag, be sure to blank out the most significant tens place display. |
| Take the hexidecimal (or binary) number residing in a particular RAM register and perform a rotation to the right 3 times. And then take the result and add 7 which can then be readily sent to a full eight bit port for displaying the BCD answer. If the rotational value is 0, be sure to blank out the most significant tens place display. |
| Take the hexidecimal (or binary) number residing in a particular RAM register and perform a multiplication by the number 7. And then take the result and swap its high and low nibbles and then add the number 3 to that result which can then be readily sent to a full eight bit port for displaying the BCD answer. If the final value is 0, be sure to blank out the most significant tens place display. |
| Take the hexidecimal (or binary) number residing in a particular RAM register and perform a time delay of 1 second. And then take the RAM value and add 1 more second and then swap the nibbles which can then be readily sent to a full eight bit port for displaying the BCD answer. If the delay required is more than 2 seconds, be sure to blank out the most significant tens place display. |
| Take the hexidecimal (or binary) number residing in a particular RAM register and perform a division by the decimal number 10 (or 0x0A). And then take the quotient and swap its high and low nibbles and then add the remainder to that result which can then be readily sent to a full eight bit port for displaying the BCD answer. If the original quotient value is 0, be sure to blank out the most significant tens place display. |
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