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Hardware Description
AT89STK-06 Demo Board User Guide 2-5
4339B–CAN–11/04
2.4 Serial Interfaces
2.4.1 RS-232C All CAN microcontrollers have one on-chip UART peripheral. Only the asynchronous
mode is supported by the AT89STK-06 board.
The AT89STK-06 board 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 2-4 . RS-232 DB9 Connections
Figure 2-5 . Typical PC Connection Lay-out
Figure 2-6. RS-232 DB9
1
RS-232 DB9 front view
pin 2
5
69
234
78
RS-TxD
pin 3 RS-RxD
pin 4
pin 6
pin 5 Gnd
pin 7 RS-CTS
pin 8 RS-RTS
AT89C51CC0x / RS-232 DB9
PC / DB9 serial port
Pin Nb
(COM1 or COMx)
Function Pin Nb Function
2TxD (AT89C51CC0x)
5Gnd
2
3
RxD (PC)
TxD (PC)3RxD (AT89C51CC0x)
5 Gnd
Green Rx LED Red Tx LED
“Auto_ISP”
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