ST67W611M1 UART interface

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1. Introduction

The ST67W611M1 has a built-in UART interface used at boot to:

Flash the module binary
Retrieve the module's OTP values
Perform RF tests with the RF test tool.
Configure a user-defined/customer-defined MAC address.

This boot selection follows the bootstrap configuration described in the BOOT section.

The ST67W611M1 built-in UART can also be used during software development to retrieve debug traces.

Warning

AT commands are not passed on UART as they are only available on SPI.

The interface is mapped to the following module pins:

UART_RX (23) pin: UART data to the module.
UART_TX (22) pin: UART data from the module.

2. UART interface specification and features

The UART interface includes various features and is configured as follows:

Full-duplex asynchronous communication.
Data bit length: 8 bits.
Stop bit length: 1 bit.
Parity: None.
Hardware flow control (RTS/CTS): None.
Baud rate: 2,000,000 Bauds.

3. UART interface hardware implementation

The module UART pins must be routed to ensure accessibility by a UART master. This could be the application host (connection to its UART pins) or an off-board UART master or bridge (through on-board test points or a provisioned connector).

Both UART signals are push-pull, so on-board pull-ups are not required. There are no specific constraints on routing these two signals since UART is not used during normal operation, as explained above.