Data Sheet

iEthernet

W5200

IMR(Interrupt Mask Register)[R/W][0x0016][0x00]

The Interrupt Mask Register is used to mask interrupts. Each interrupt mask bit corresponds to

a bit in the Interrupt Register2 (IR2). If an interrupt mask bit is set, an interruption will be

issued whenever the corresponding bit in the IR2 is set. If any bit in the IMR is set as ‘0’ an

interrupt will not occur though the bit.

7 6 5 4 3 2 1 0

S7_IMR S6_IMR S5_IMR S4_IMR S3_IMR S2_IMR S1_IMR S0_IMR

Bit

Symbol Description

7 S7_IMR IR2(S7_INT) Interrupt Mask

6 S6_IMR IR2(S6_INT) Interrupt Mask

5 S5_IMR IR2(S5_INT) Interrupt Mask

4 S4_IMR IR2(S4_INT) Interrupt Mask

3 S3_IMR IR2(S3_INT) Interrupt Mask

2 S2_IMR IR2(S2_INT) Interrupt Mask

1 S1_IMR IR2(S1_INT) Interrupt Mask

0 S0_IMR IR2(S0_INT) Interrupt Mask

RTR (Retry Time-value Register) [R/W] [0x0017 – 0x0018] [0x07D0]

It configures the retransmission timeout-period. The standard unit of RTR is 100us. RTR is

initialized with 2000(0x07D0) and has 200ms timeout-period.

Ex) When timeout-period is set as 400ms, RTR = (400ms / 1ms) X 10 = 4000(0x0FA0)

0x0017 0x0018

0x0F 0xA0

Re-transmission will occur if there is no response from the remote peer to the commands of

CONNECT, DISCON, CLOSE, SEND, SEND_MAC and SEND_KEEP, or the response is delayed.

RCR (Retry Count Register) [R/W] [0x0019] [0x08]

It configures the number of retransmission times. When retransmission occurs as many as

‘RCR+1’ times, Timeout interrupt is set (‘TIMEOUT’ bit of Sn_IR is set as ‘1’).

In case of using TCP communication, the value of Sn_SR (Socket n Status Register) is

changed to ‘SOCK_CLOSED’ and Sn_IR(Socket n Status Register) (TIMEOUT) turns into ‘1’.

In case of not using TCP communication, only Sn_IR(TIMEOUT) turns into ‘1’.

Ex) RCR = 0x0007

0x0019

0x07