Atmel STK526, Руководство пользователя, Страница: 14 / 38

Using the STK526
2-14 STK526 rev. B Hardware User Guide
7709B–AVR–05/07
2.5.2 RS-232C
The AT90USB82/162 is a microcontroller with an on-chip USART peripheral (USART1).
Only the asynchronous mode is supported by the STK526.
The STK526 is supplied with a RS-232 driver/receiver. One female DB9 connector
assumes the RS-232 connections.
Figure 2-9 . RS-232 DB9 Connections
Figure 2-10 . Typical PC Connection Layout
1
RS-232 DB9 front view
pin 2
5
6 9
2 3 4
7 8
RS-TxD
pin 3 RS-RxD
pin 4
pin 6
pin 5 GND
pin 7 RS-CTS
pin 8 RS-RTS
STK525 / RS-232 DB9
PC / DB9 serial port
Pin No
(COM1 or COMx)
Function Pin No Function
2 TxD (AT90USBxxx)
5 GND
2
3
RxD (PC)
TxD (PC) 3 RxD (AT90USBxxx)
5 GND
7 CTS (AT90USBxxx) 7
8
RTS (PC)
CTS (PC) 8 RTS (AT90USBxxx)
If Hardware Data Flow Control