Host Connection; Serial Interface: Uart; Reset Behaviour - We PROTEUS-III User Manual

WIRELESS CONNECTIVITY & SENSORS
User manual Proteus-III

6. Host connection

6.1. Serial interface: UART

The configuration in factory state of the UART is 115200 Baud without flow control and with
data format of 8 data Bits, no parity and 1 stop Bit ("8n1"). The baud rate and flow control of
the UART can be configured by means of the UserSetting UART_ConfigIndex . The data format
is fixed to 8n1.
The output of characters on the serial interface runs with secondary priority. For this reason,
short interruptions may occur between the outputs of individual successive Bytes. The host
must not implement too strict timeouts between two Bytes to be able to receive packets that
have interruptions in between.

6.1.1. Reset behaviour

When holding the module's /RESET pin LOW, the radio chip states are undefined. In this case
the modules UTXD pin may be pulled LOW by the radio module, such that the connected host
controller's UART may detect a 0x00-byte with frame error.
To guarantee a clean UART communication, the host controller may not accept bytes with
frame errors and flush its RX buffer, after pulling the module's /RESET pin LOW.
Order code 2611011024000
62
Version 1.8 , July 2022 www.we-online.com/wcs