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 3-2.

Note:

If a repeated START condition transmits, the status code is 10h instead of 08h.

Table 3-2. Codes After Servicing Interrupts (Master Transmit)

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

B0h

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

D0h

Second Address byte +
W, transmitted ACK
received

Write byte to DATA, clear IFLG

OR

Set STA, clear IFLG

OR

Set STP, clear IFLG

OR

Set STA & STP, clear IFLG

Transmit data byte, receive ACK

Transmit repeated START

Transmit STOP

Transmit STOP, then START

D8h

Second Address byte +
W, transmitted ACK
received

Same as code D0h