Using the STK526
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
provides the RS-232 connections.
Figure 2-11 . RS-232 DB9 Connections
pin 2
pin 3
RS-TxD
RS-RxD
RS-232 DB9 front view
5 4 3 2 1
pin 4
pin 6
9 8 7 6
Figure 2-12 . Typical PC Connection Layout
STK526 / RS-232 DB9
pin 5
pin 7
pin 8
GND
RS-CTS
RS-RTS
PC / DB9 serial port
(COM1 or COMx)
Function
TxD (AT90USBxxx)
RxD (AT90USBxxx)
GND
Pin No
2
3
5
Pin No
2
3
5
Function
RxD (PC)
TxD (PC)
GND
If Hardware Data Flow Control
STK526 rev. B Hardware User Guide
CTS (AT90USBxxx)
RTS (AT90USBxxx)
7
8
7
8
RTS (PC)
CTS (PC)
2-13
7709B–AVR–07/08
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