PIC Microcontroller and Embedded Systems 1/e By Muhammad Mazidi, Rolin McKinlay, and Danny Causey © 2008 Pearson Education, Inc. Pearson Prentice Hall Upper Saddle River, NJ Figure Serial versus Parallel Data Transfer

PIC Microcontroller and Embedded Systems 1/e By Muhammad Mazidi, Rolin McKinlay, and Danny Causey © 2008 Pearson Education, Inc. Pearson Prentice Hall Upper Saddle River, NJ Figure Simplex, Half-, and Full-Duplex Transfers

PIC Microcontroller and Embedded Systems 1/e By Muhammad Mazidi, Rolin McKinlay, and Danny Causey © 2008 Pearson Education, Inc. Pearson Prentice Hall Upper Saddle River, NJ Figure Framing ASCII ‘A’ (41H)

PIC Microcontroller and Embedded Systems 1/e By Muhammad Mazidi, Rolin McKinlay, and Danny Causey © 2008 Pearson Education, Inc. Pearson Prentice Hall Upper Saddle River, NJ Figure RS232 Connector DB-25

PIC Microcontroller and Embedded Systems 1/e By Muhammad Mazidi, Rolin McKinlay, and Danny Causey © 2008 Pearson Education, Inc. Pearson Prentice Hall Upper Saddle River, NJ Figure DB-9 9-Pin Connector

PIC Microcontroller and Embedded Systems 1/e By Muhammad Mazidi, Rolin McKinlay, and Danny Causey © 2008 Pearson Education, Inc. Pearson Prentice Hall Upper Saddle River, NJ Figure Null Modem Connection

PIC Microcontroller and Embedded Systems 1/e By Muhammad Mazidi, Rolin McKinlay, and Danny Causey © 2008 Pearson Education, Inc. Pearson Prentice Hall Upper Saddle River, NJ Figure (a) Inside MAX232 and (b) its Connection to the PIC18 (Null Modem)

PIC Microcontroller and Embedded Systems 1/e By Muhammad Mazidi, Rolin McKinlay, and Danny Causey © 2008 Pearson Education, Inc. Pearson Prentice Hall Upper Saddle River, NJ Figure (a) Inside MAX233 and (b) Its Connection to the PIC18 (Null Modem)

PIC Microcontroller and Embedded Systems 1/e By Muhammad Mazidi, Rolin McKinlay, and Danny Causey © 2008 Pearson Education, Inc. Pearson Prentice Hall Upper Saddle River, NJ Figure TXSTA: Transmit Status and Control Register

PIC Microcontroller and Embedded Systems 1/e By Muhammad Mazidi, Rolin McKinlay, and Danny Causey © 2008 Pearson Education, Inc. Pearson Prentice Hall Upper Saddle River, NJ Figure TXSTA: Transmit Status and Control Register (cont.)

PIC Microcontroller and Embedded Systems 1/e By Muhammad Mazidi, Rolin McKinlay, and Danny Causey © 2008 Pearson Education, Inc. Pearson Prentice Hall Upper Saddle River, NJ Figure RCSTA: Receive Status and Control Register

PIC Microcontroller and Embedded Systems 1/e By Muhammad Mazidi, Rolin McKinlay, and Danny Causey © 2008 Pearson Education, Inc. Pearson Prentice Hall Upper Saddle River, NJ Figure PIR1 (Peripheral Interrupt Register 1)

PIC Microcontroller and Embedded Systems 1/e By Muhammad Mazidi, Rolin McKinlay, and Danny Causey © 2008 Pearson Education, Inc. Pearson Prentice Hall Upper Saddle River, NJ Figure Simplified USART Transmit Block Diagram