C167CS datasheet(381/517 Pages) INFINEON

381 / 517 page

C167CS

Derivatives

The On-Chip CAN Interface

User’s Manual

19-9

V2.0, 2000-07

Note: Reading the upper half of the Control Register (status partition) will clear the

Status Change Interrupt value in the Interrupt Register, if it is pending. Use byte

accesses to the lower half to avoid this.

LEC

Last Error Code

This field holds a code which indicates the type of the last error occurred on

the CAN bus. If a message has been transferred (reception or transmission)

without error, this field will be cleared.

No Error

Stuff Error: More than 5 equal bits in a sequence have occurred in a

part of a received message where this is not allowed.

Form Error: Wrong format in fixed format part of a received frame.

AckError: The message this CAN controller transmitted was not

acknowledged by another node.

Bit1Error: During the transmission of a message (with the exception

of the arbitration field), the device wanted to send a

recessive level

(“1”), but the monitored bus value was

dominant.

Bit0Error: During the transmission of a message (or acknowledge bit,

active error flag, or overload flag), the device wanted to send a

dominant level (“0”), but the monitored bus value was recessive.

During

busoff recovery this status is set each time a sequence of 11

recessive bits has been monitored. This enables the CPU to monitor

the proceeding of the busoff recovery sequence (indicates that the bus

is not stuck at

dominant or continously disturbed).

CRCError: The received CRC check sum was incorrect.

Unused code: may be written by the CPU to check for updates.

TXOK

Transmitted Message Successfully

Indicates that a message has been transmitted successfully (error free and

acknowledged by at least one other node), since this bit was last reset by the

CPU (the CAN controller does not reset this bit!).

RXOK

Received Message Successfully

This bit is set each time a message has been received successfully, since

this bit was last reset by the CPU (the CAN controller does not reset this bit!).

RXOK is also set when a message is received that is not accepted (i.e. stored).

EWRN

Error Warning Status

Indicates that at least one of the error counters in the EML has reached the

error warning limit of 96.

BOFF

Busoff Status

Indicates when the CAN controller is in busoff state (see EML).

Bit

Function (Control Bits)

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