Interrupts

The radio transceiver AT86RF212 notifies the MCU about the occurrence of internal asynchronous events with interrupt requests (IRQs). The IRQs are signalled on the interrupt pins TRX_PIN_IRQ and TRX_PIN_DIG2.

The pin TRX_PIN_IRQ is the main interrupt of the radio transceiver and has a status register (RG_IRQ_STATUS) and a mask register (RG_IRQ_MASK) assigned. The following interrupt causes are signalled on the pin TRX_PIN_IRQ:

• -------1 : 0x01 : TRX_IRQ_PLL_LOCK
• ------1- : 0x02 : TRX_IRQ_PLL_UNLOCK
• -----1-- : 0x04 : TRX_IRQ_RX_START
• ----1--- : 0x08 : TRX_IRQ_TRX_END
• ---1---- : 0x10 : TRX_IRQ_CCA_ED_DONE
• --1----- : 0x20 : TRX_IRQ_AMI
• -1------ : 0x40 : TRX_IRQ_TRX_UR
• 1------- : 0x80 : TRX_IRQ_BAT_LOW

The pin TRX_PIN_DIG2 can be configured as a second interrupt. It signals only RX_START interrupts, is not maskable and is intended as receive frame time stamp interrupt (see section RX Frame Time Stamping).

Note:

The actual interrupt causes can also be monitored using the SPI Command Mode.

The chapter is subdivided into the following sections:

• Configuration
  • Interrupt Configuration and Handling
• Interrupt Causes
  • PLL Interrupts
  • Transmit and Receive Interrupts
  • Awake Interrupt
  • CCA/ED Ready Interrupt
  • Buffer Underrun Interrupt
  • Battery Low Interrupt