Pin Allocation Figure 1: The GPIO allocation with CPU module and Expansion Module. GPIOFunctionGPIO14RX GSM(TXD0)GPIO15TX GSM(RXD0)GPIO20GSM RESETGPIO21GSM STATUSGPIO16USB ENABLE (Power Key)Table 1: GPIO Allocation Doc navigation← Datasheet Was this article helpful to you? Yes No How can we help? Name Email subject message
