Atmel AT89STK-06 2.4Serial Interfaces, Figure, Figure, RS-232C, Figure 2-6. RS-232DB9

Hardware Description

2.4Serial 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

RS-TxD

pin 2

RS-232 DB9 front view

pin 3

RS-RxD

pin 4

pin 6

5

4

3

2

1

Gnd

9

8

7

6

pin 5

RS-CTS

pin 7

Figure 2-5 .Typical PC Connection Lay-out

pin 8

RS-RTS

AT89C51CC0x / RS-232 DB9

PC / DB9 serial port

(COM1 or COMx)

Function

Pin Nb

Pin Nb

Function

TxD (AT89C51CC0x)

2

2

RxD (PC)

RxD (AT89C51CC0x)

3

3

TxD (PC)

Gnd

5

5

Gnd

Figure 2-6. RS-232 DB9

“Auto_ISP” Jumpers

Green Rx LED Red Tx LED

AT89STK-06 Demo Board Software Demo Guide 2-5

4339C–CAN–07/05