Ebyte E34-2G4H27D User Manual

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Ebyte E34-2G4H27D User Manual Manual pdf 8 page image

Chengdu Ebyte Electronic Technology Co., Ltd E34-2G4H27D User ManualCopyright ©2012–2019，Chengdu Ebyte Electronic Technology Co., Ltd 75.2 Reset When the module is powered, AUX outputs low level immediately, conducts hardware self-check and sets theoperating mode based on user’s parameters. During the process, the AUX remains low level. After the processcompleted, 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.5.3 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 sentthrough UART, or whether the module is still in the process of self-check initialization5.3.1 Indication of UART output To wake up external MCU5.3.2 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): whenAUX=0, the internal 256 bytes data in the buffer have not been written to the RFIC completely. If the user starts totransmit data at this circumstance, it may cause overtime when the module is waiting for the user data, or transmittingwireless sub package. When AUX = 1, it does not mean that all the UART data of the module have been transmitted already, perhaps thelast packet of data is still in transmission.