User manual

PICkit™ Serial Analyzer User’s Guide

9.8 USART COMMUNICATIONS

Universal Synchronous Asynchronous Receive Transmit (USART) protocol is a stan-

dard 2-wire serial communication. In Asynchronous mode, there is a transmit line and

a receive line. In Synchronous mode, the transmit line becomes the clock line and the

receive line becomes the bidirectional data line. In Asynchronous mode, 8 bits are

framed by a Start and Stop bit. A ninth bit can be included to use as a parity bit.

To configure the protocol, set the clock polarity to rising edge or falling edge if using

Synchronous mode. Enable or disable 9-bit words and enable or disable the asynchro-

nous receiving ability of the PICkit™ Serial Analyzer. Select the baud rate according to

the BRG table.

TABLE 9-26: CONNECTOR PINOUT IN USART ASYNCHRONOUS MODE

TABLE 9-27: CONNECTOR PINOUT IN USART SYNCHRONOUS MODE

Pin Description

1TX

2+V

4—

5—

6RX

Pin Description

1Clock

2+V

4—

5—

6Data