Datasheet

W5500 Datasheet Version1.0.9 41 / 66
UIPR (Unreachable IP Address Register) [R] [0x0028-0x002B] [0x00000000]
UPORTR (Unreachable Port Register) [R] [0x002C-0x002D] [0x0000]
W5500 receives an ICMP packet(Destination port unreachable) when data is sent to
a port number which socket is not open and UNREACH bit of IR becomes ‘1’ and UIPR
& UPORTR indicates the destination IP address & port number respectively.
Ex) In case of “192.168.0.11”
0x0028
0x0029
0x002A
0x002B
192 (0xC0)
168 (0xA8)
0 (0x00)
11 (0x0E)
Ex) In case of “0x1234”
0x002C
002D
18 (0x12)
52(0x34)