What is the main difference between the Zigbee's standard-power firmware and the low-power firmware for users?

Compared with the standard firmware, the low-power firmware adds a wake-up function. And two pins should be added to the circuit for the connection. The PWM1 is used for the Zigbee to wake up the MCU, and the pwm2 is used for the MCU to wake up the Zigbee.