DVK90CAN1 Datasheet, PDF (18/61 Pages) ATMEL Corporation – AT90CAN128 TQFP device (3 or 5V),

3.6 Serial Links
3.6.1 RS-232C
Using the DVK90CAN1
The AT90CAN128 is a micro-controller with two on-chip USART peripherals, USART0.
and USART1. Only the asynchronous mode is supported by the DVK90CAN1.
The DVK90CAN1 is supplied with a RS-232 driver/receiver. Only one female DB9
connector assumes the RS-232 connections. A full range of configuration can be set
with two Rx lines and two Tx lines.
Figure 3-11 . RS-232 DB9 Connector
RS-232 DB9
Figure 3-12 . RS-232 DB9 Connections
RS-232 DB9 front view
54321
9876
pin 2
pin 3
pin 4
pin 6
pin 5
pin 7
pin 8
RS-TxD
RS-RxD
GND
RS-CTS (TxD)
RS-RTS (RxD)
Figure 3-13 . Typical PC Connection Lay-out
DVKCAN11 / RS-232 DB9
PC / DB9 serial port
(COM1 or COMx)
Function
TxD (AT90CAN128)
RxD (AT90CAN128)
GND
Pin No
2
3
5
Pin No
2
3
5
Function
RxD (PC)
TxD (PC)
GND
CTS (AT90CAN128)
RTS (AT90CAN128)
If Hardware Data Flow Control
7
7
8
8
RTS (PC)
CTS (PC)
DVK90CAN1 Hardware User Guide
3-17
4381B–AVR–07/08