Lantronix DSTni-EX - Manual (Page 80)

72
Interrupt Flags
The following flags are set on internal events (they activate an interrupt line when enabled).
They are cleared by writing a ‘ 1’ to the appropriate flag. Acknowledging the tx_msg interrupt
also acknowledges all tx_xmit interrupt sources. Acknowledging one of the tx_xmit interrupt
sources also acknowledges the tx_msg interrupt.
Note: The reset value of this register’s bits is indeterminate.
Table 5-36. Interrupt Flags
BIT 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
OFFSET 46h
FIELD
RX_MSG TX_MSG TX_XMIT2 TX_XMIT1 TX_XMIT0 BUS_O
FF
CRC_ERR FORM_ERR ACK_ERR STUF_ERR BIT_ERR RX_OVR OVR_LOAD ARB_LO
SS
///
RESET − − − − − − − − − − − − − − − −
R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W
Table 5-37. Interrupt Flag Definitions
Bits Field Name Description
15 RX_MSG Rx Message
Depending on rx_level, at least one message is available.
14 TX_MSG Tx Message
Depending on rx_level, at least one message is empty.
13 TX_XMIT2 Tx Xmit 2
Indicates that the message was successfully sent.
12 TX_XMIT1 Tx Xmit 1
Indicates that the message was successfully sent.
11 TX_XMIT0 Tx Xmit 0
Indicates that the message was successfully sent.
10 BUS_OFF Bus Off State
CAN has reached the bus off state.
9 CRC_ERR CRC Error
CRC error occurred while sending or receiving a message.
8 FORM_ERR Format Error
Format error occurred while sending or receiving a
message.
7 ACK_ERR Acknowledgement Error
Acknowledgement error occurred while sending or receiving
a message.
6 STUF_ERR Stuffing Error
Stuffing error occurred while sending or receiving a
message.
5 BIT_ERR Bit Error
Bit error occurred while sending or receiving a message.
4 RX_OVR Receiver Overrun
A new message arrived while the receive buffer is full. This
Flag is set if either the incoming message overwrites an
existing one or is discarded.
3 OVR_LOAD Overload Condition
An overload condition has occurred.
2 ARB_LOSS Arbitration Loss
Arbitration was lost while sending a message.
1:0 /// Reserved