E$9\mathrm{.}6$ Add an echo flag $(1$ byte$)$ and modify Example $9\mathrm{.}5$ so that the received character will be echoed back to the SCIO when the flag is $1.$ Otherwise, no echo will be performed. PLEASE HELP ME TO DO PROBLEM $9\mathrm{.}6$ BY USING C PROGRAM This is Example $9\mathrm{.}5$

Write a subroutine to read a character from the SCIO using the polling method. The character will be returned in accumulator $A.$

Solution: Using the polling method, the subroutine will wait until the RDRF bit $($bit $5)$ of the

SCIOSRI register becomes set and then read the character held in the SCIODRL register. The

subroutine that reads a character from SClO is as follows: The $C$ language version of the function is as follows: