Receiving interrupt for MCU

I have an Xbee module (XBee ZigBee Module) as an end device. This device is connected to a MCU (STM32F4). The MCU is in the sleep mode when there is no data received from the Xbee module.

So I would like to use an interrupt to wake the MCU up when there is data received by the Xbee module. I am using UART for communication between the MCU and the transceiver.

I would like to know if there is a pin in the Xbee module which can be used as an interrupt to wake the MCU up. Please let me know if you have any idea.

Best regards,

any ideas? Hope I can get some feedbacks. This function is quite important for my application.