Writing with UART-USB Cable
Writing firmware using a UART-USB cable or USB-to-serial IC
You can also write firmware using commercially available 3.3V UART-USB cables or USB-to-serial converter ICs.
Unless there are special circumstances, we recommend using the TWELITE dedicated USB adapter ( TWELITE R2 / TWELITE R3 ), which allows easy firmware writing.
How to Connect
Connection Example
How to Start in Programming Mode
- While holding the program signal pin (pin 7) to GND, power on or reset the device.
- Return the program signal pin to HIGH or OPEN.