Auto Downloader Burner USB to Serial Burner Module USB to TTL Module for ESP32 ESP8266 3pcs

series description 1. GPI02, GPI00 and MTD0 are used to select the startup mode and SD10 mode; for GP100 download mode: external pull-down, run mode: suspend or external pull-up; 2. UOTXD should be avoided to be externally pulled down to a low level during the power-up period. 3.UARTO will output printing during power-on startup by default, the baud rate of the printed content during this period is related to the frequency of the crystal used. When using 40MHz crystal, the baud rate of this section is 115200; when using 26MHz crystal, the baud rate of this section is 74880. If the print information affects the function of the device, it is recommended that UOTXD and UORXD be exchanged during the power-up period with UORTS(MTDO) and UOCTS(MTCK) respectively to shield the print; 4 where GPI00 connects to the download module, it should avoid being pulled down externally; 3. 4. where GPI00 connects to the B00T pin of the download module.

1. Series Description 1.is released for 2020 with powerful performance. Very low power Soc with RISC-V 32-bit single core processor. 2.GP109 is connected to internal weak pull-up by default. If there is no external connection on this pin or the connected external line is in high impedance state, the latch value is 1; 3. Its B00T pin is 109, so the B00T pin of the burning module needs to be connected to the 109 pin of the (V1.1 version of the motherboard). UARTO is used for downloading firmware and outputting logs. ;