Lantronix DSTni-EX Benutzerhandbuch

Servicing the Interrupt
After servicing this interrupt and transmitting the second part of the address, the Status register
contains one of the codes in Table 3-5.

Table 3-5. Codes After Servicing Interrupt (Master Receive)

Code

C State

Microprocessor Response

Next I

C Action

38h

Arbitration lost

Clear IFLG

OR

Set STA, clear IFLG

Return to idle

Transmit START when bus free

68h

Arbitration lost,
SLA + W received,
ACK transmitted

Clear IFLG, AAK=0

OR

Clear IFLG, AAK=1

Receive data byte, transmit not ACK

Receive data byte, transmit ACK

78h

Arbitration lost,
SLA + R received,
ACK transmitted

Write byte to DATA, Clear IFLG,
AAK=0

OR

Write byte to DATA, Clear IFLG,
AAK=1

Transmit data byte, receive ACK

Transmit data byte, receive ACK

B0h

Arbitration lost

Clear IFLG

OR

Set STA, clear IFLG

Return to idle

Transmit START when bus free

E0h

Second Address byte +
R transmitted, ACK
received

Clear IFLG, AAK=0

OR

Clear IFLG, AAK=1

Receive data byte, transmit not ACK

Receive data byte, transmit ACK

E8h

Second Address byte +
R transmitted, ACK not
received

Clear IFLG, AAK=0

OR

Clear IFLG, AAK=1

Receive data byte, transmit not ACK

Receive data byte, transmit ACK