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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.
DS51647A-page 90
TABLE 9-26:
Pin
1
2
3
4
5
6
TABLE 9-27:
Pin
1
2
3
4
5
6
CONNECTOR PINOUT IN USART ASYNCHRONOUS MODE
Description
TX
+V
G ND
—
—
RX
CONNECTOR PINOUT IN USART SYNCHRONOUS MODE
Description
Clock
+V
G ND
—
—
Data
? 2007 Microchip Technology Inc.
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