Datasheet

W5500 Datasheet Version1.0.9 35 / 66
IR (Interrupt Register) [R/W] [0x0015] [0x00]
IR indicates the interrupt status. Each bit of IR can be cleared when the host writes
‘1’ value to each bit. If IR is not equal to ‘0x00’, INTn PIN is asserted low until it is
‘0x00’.
7
6
5
4
3
2
1
0
CONFLICT
UNREACH
PPPoE
MP
Reserved
Reserved
Reserved
Reserved
Bit
Symbol
Description
7
CONFLICT
IP Conflict
Bit is set as ‘1’ when own source IP address is same with the sender
IP address in the received ARP request.
6
UNREACH
Destination unreachable
When receiving the ICMP (Destination port unreachable) packet,
this bit is set as ‘1’.
When this bit is ‘1’, Destination Information such as IP address and
Port number may be checked with the corresponding UIPR &
UPORTR.
5
PPPoE
PPPoE Connection Close
When PPPoE is disconnected during PPPoE mode, this bit is set.
4
MP
Magic Packet
When WOL mode is enabled and receives the magic packet over
UDP, this bit is set.
3~0
Reserved
Reserved