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User’s Manual of Board Microcontroller “ET-ARM STAMP STM32 (Cortex-M3)

Application of RS232

Port RS232 is signal RS232 that has already been converted signal MAX3232, so USART1 can be connected with

signal RS232 to receive-transmit can be used to be ISP Download t data. Moreover, USART1 o download Hex File into

MCU. In this case, it must be used with Jumper (BOOT1) SW (BOOT0) and SW (RESET) to reset CPU to start running in Boot-Loader Mode to download Hex File into CPU (see more detail from “To Download Hex File into MCU of Board”).

USART1(Download)

1

2

3

4

+3V3 RXD1 TXD1 GND

  • USART1 uses signal Pin from PA9(TXD1) and PA10(RXD1).

1

CD

6

DSR

2

RXD

7

RTS

3

TXD

8

CTS

4

DTR

9

RI

5

GND

The Cable that is used to connect RS232 between Comport of computer PC and Connector USART-1 and USART-2 of Board ET-ARM STAMP STM32 is shown as follows;

Figure display the Cable circuit for RS232.

DB9(FEMALE) RS232-PC

ET-RS232

RXD TXD GND

1 2 3 4

WWW.ETT.CO.TH

4

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