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5 Function description
5.1 Reset
When the module is powered, AUX outputs low level immediately, conducts hardware self-check and sets the operating
mode based on user's parameters. During the process, the AUX remains low level. After the process completed, the AUX
outputs high level and starts to work as per the operating mode combined by M1 and M0. Therefore, users need to wait the
AUX rising edge as the start of module's normal work.
5.2 AUX description
AUX Pin can be used as indication for wireless send & receive buffer and self-check.
It can indicate whether there are data that are not sent yet via wireless way, or whether all wireless data has been sent
through UART, or whether the module is still in the process of self-check initialization.
5.2.1 Indication of UART output
To wake up external MCU
5.2.2 Indication of wireless transmitting
Buffer (empty): the internal 256 bytes data in the buffer are written to the RFIC (Auto sub -packaging).
When AUX=1, the user can input data less than 256 bytes continuously without overflow. Buffer (not empty): when
AUX=0, the internal 256 bytes data in the buffer have not been written to the RFIC completely. If the user starts to
transmit data at this circumstance, it may cause overtime when the module is waiting for the user data, or transmitting
wireless sub package.
When AUX = 1, it does not mean that all the UART data of the module have been transmitted already, perhaps the
last packet of data is still in transmission.
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