Lantronix DSTni-EX - Manual (Page 34)

26
Bits Field Name Description
2 AAK Acknowledge
1 = send Acknowledge (LOW level on SDA) during acknowledge clock pulse on
the I
2 C bus if:
−The entire 7-bit slave address or the first or second bytes of a 10-bit slave
address are received.
− The general call address is received and the GCE bit in the ADDR register is
set to one.
− A data byte is received in master or slave mode.
0 in slave transmitter mode = send Not Acknowledge (HIGH level on SDA) when
a data byte is received in master or slave mode. After this byte transmits, the I
2 C
controller enters state C8h and returns to idle state. The I 2 C controller does not
respond as a slave unless AAK is set.
1:0 /// Reserved
Status Register
The Status register is a Read Only register that contains a 5-bit status code in the five most-
significant bits. The three least-significant bits are always zero. This register can contain any of
the 31 status codes in Table 3-16. When this register contains the status code F8h:
No relevant status information is available.
No interrupt is generated.
The IFLG bit in the Control register is not set.
All other status codes correspond to a defined state of the I 2 C controller, as described in Table
3-16.
When entering each of these states, the corresponding status code appears in this register and
the IFLG bit in the Control register is set. When the IFLG bit clears, the status code returns to
F8h
If an illegal condition occurs on the I 2 C bus, the bus enters the bus error state (status code 00h).
To recover from this state, set the STP bit in the Control register and clear the IFLG bit. The I 2 C
controller then returns to the idle state. No STOP condition transmits on the I 2 C bus.
Note: The STP and STA bits can be set to 1 at the same time to recover from the bus error,
causing the I
2
C controller to send a START.
Table 3-14. Status Register
BIT 7 6 5 4 3 2 1 0
OFFSET
D006
FIELD
STATUS CODE /// /// ///
RESET 0 0 0 0 0 0 0 0
RW R R R R R R R R