Question $(15$ p$.)$ : There are two figures below; $1.$ One frame of the Universal Asynchronous Receiver Transmitter $($UART$)$ package, $2.$ Block diagram of the UART Transmitter.

a$)$ Draw lines correctiy connecting the bits of one frame with the corresponding bits in the transmit shift register.

b$)$ When will be the TXEF flag set $($become $1)?$ What should be prohibited in this case?

c$)$ When will be the TXFF flag set $($become $1)?$ What should be prohibited in this case?