What happens if you repeatedly read a character from a serial port Receive Data Register without first checking that the Receive Data Ready bit is 1?Question 4Select one:a.The CPU would generate a General Protection Fault (GPF) exception, unless - by chance - the RDR bit happened to be 1.b.The CPU would wait until a valid character has been received before executing the "lw" instruction.c.You would never receive a valid character.d.You would likely "receive" the same character multiple times.
Question
What happens if you repeatedly read a character from a serial port Receive Data Register without first checking that the Receive Data Ready bit is 1?Question 4Select one:a.The CPU would generate a General Protection Fault (GPF) exception, unless - by chance - the RDR bit happened to be 1.b.The CPU would wait until a valid character has been received before executing the "lw" instruction.c.You would never receive a valid character.d.You would likely "receive" the same character multiple times.
Solution
d. You would likely "receive" the same character multiple times.
This is because the Receive Data Ready bit is used to indicate when new data has been received and is ready to be read from the Receive Data Register. If you read from the register without first checking this bit, you may end up reading the same data that was previously received, as the register has not been updated with new data.
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