Consider a serial port operating with a baud rate of 1000 bits per second. Draw the waveform occurring at the PS3 output (voltage levels are +5 and 0) when the ASCII ‘B' ($42) is transmitted on SCI1. The protocol is one start, eight data, and one stop bit. SCI1 is initially idle, and the software writes the $42 to SCI1DRL at time = 0. Show the PS3 line before and after the frame, assuming the channel is idle before and after the frame.