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DS-2472-01 <Rev.0.0> page 27/ 63
3.5.2. Interrupt Signal
The DKL 1908_V.1 provides an output interrupt pin (pin 6, INT) with selectable polarity. The DKL
1908_V.1 issues interrupts to the host MCU on three possible events. For each event, the DKL 1908_V.1 sets
the corresponding status bit in REG0x31. If the corresponding interrupt mask in REG0x32 is clear (i.e.
equals ‘0’), an interrupt will be issued on pin 6. If it is set to ‘1’ (masked), no interrupt will be issued, but the
status is still present. Whenever REG0x31 is read, the interrupt and the status are cleared. The three
interrupt events are described as below:
Wake-up alert interrupt (WAKEIF)
Every time a wake-up event happens, the DKL 1908_V.1 issues the interrupt event.
Packet received interrupt (RXIF)
This interrupt is issued when an available packet is received in the RXFIFO. An available packet means that
it passes an RXMAC filter, which includes frame type identifying, address filtering and FCS check.
TX FIFO release interrupt (TXNIF)
This interrupt can be issued in two possible conditions. The conditions are when a packet in TXFIFO is
triggered and sent successfully, or when a packet is triggered and the retransmission is timed out.