Lantronix DSTni-EX Manual de usuario descargar pdf (Pagina 80)

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_OFF

CRC_ERR

FORM_ERR

ACK_ERR

STUF_ERR

BIT_ERR

RX_OVR

OVR_LOAD

ARB_LOSS

///

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

1 2 ... 75 76 77 78 79 80 81 82 83 84 85 ... 94 95

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Lantronix DSTni-EX Manual de usuario Pagina 80

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