SieMo S50037 Data Book PRELIMINARILY

UART Interface

Overview

￿Universal Asynchronous Receiver Transmitter

￿Standard 16550 compatible UART interface

￿Min 9600Baud, Max 1.5MBaud

￿UART_TX and UART_RX used to transmit data

￿UART_CTS and UART_RTS used to implement RS232 hardware flow control

The UART (Universal Asynchronous Receiver Transmitter) provides a simple mechanism to communicate with other devices. The UART uses 4 (or 2 if HW – Handshake is not in use)) lines for serial data transmission.

figure 16 UART Directions

UART Settings

Property

Possible Values

Default Setting

Baud Rate

Max 1.536 MBaud

115.2 kBaud

 

Min 9600 baud

 

Flow Control

RTS/CTS or None10

RTS/CTS

Parity

On or Off

Off

Number of Stop

1 or 2

1

Bits

 

 

Note: To communicate with a standard PC a level-converter is required. SieMo uses 0V and 3V levels. Standard PC usually provide baudrates up to 115.2 kBit/s, if SieMo shall communicate with a PC at higher data rates an accelerated serial port adapter and a appropriate level converter is required. It is strongly recommended to use a level converter with ESD protection. See Application below.

10The CTS input must be de-assigned by the host for the duration of at least 4 bits (e.g. 35 ms with a baudrate of 115.2 kBaud). Any shorter period of de-assigning the handshake input can cause incorrect function.

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Siemens S50037 manual Uart Interface, Uart Settings, Property Possible Values Default Setting, Rts/Cts