Datasheet

W5500 Datasheet Version1.0 (August 2013) 35 / 65
IR (Interrupt Register) [R/W] [0x0015] [0x00]
IR indicates the interrupt status. Each bit of IR will be still „1‟ until the bit will be
written to „1‟ by the host. 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