$55.$ Which of the following statements about the UART communication is not correct? $($A$)$ It is a serial communication $($B$)$ Programmers can write values into Transmit or Receive registers and read the contents of them $($C$)$ Transmit Interrupt flag is raised when the Transmit buffer is empty $($D$)$ Receive Interrupt flag is raised when the Receive buffer is full $($E$)$ Programmers are able to read the contents of Transmit Shift Register $($TSR$).56.$ Once we know how to $($A$)$ setup BIOS $($B$)$ program Windows APIs $($C$)$ apply TCP$/$IP $($D$)$ insert PCI cards $($E$)$ install RTX system, PC can control or transfer data to devices connected thereto without additional software or hardware. $57.$ As the oscillator's frequency is $5$M Hz and the internal clock is configured to be XT with PLL$\_$MULTIPLITY being $16,$ then about $($A$)12\mathrm{.}5$ns $($B$)34$ns $($C$)50$ns $($D$)200$ns $($E$)500$ns is needed to execute an instruction. $58.$ Following Prob. #$57,$ setting the register PEPER of the PWM module by $($A$)1000($B$)1500($C$)2000($D$)2500($E$)3000$ will obtain PWM signal output at the frequency of $20$k Hz$.59.$ Following Prob. #$57,$ and the Pre$-$scale value of Timerl counter is set to one. Then, to involve Timerl in functioning $0\mathrm{.}0001$sec delay, the register PR$1$ should be set by $($A$)1000($B$)1500($C$)2000($D$)2500($E$)3000.60.$ Follows Prob. #$57.$ As the register SPBRG is set to be $50,$ the baud rate of serial transmission with UART will be about $($A$)50$k $($B$)20$k $($C$)10$k $($D$)2$k $($E$)9600.$