The ability to communicate with other devices is an important function available in the PIC. With this communication system, the PIC can send or receive instructions or data from other devices or systems. a) Differentiate between Synchronous and Asynchronous communication in PIC. b) State THREE (3) required pins when using DB9. (4 marks) (3 marks) c) Draw the circuit diagram between the MAX232 IC as in Figure Q4 with microcontroller and DB9 (use pin labels to represent the PIC and DB9). 16 2345 2 15 MAX232 14 13 12 11 10 Figure Q4 (8 marks) d) Design a simple program that will read an input from the USART. Every time the PIC received the input, the program should return a value less than the initial value set to the USART. Let the initial value equal to 50. (10 marks)