STR720 datasheet(213/401 Pages) STMICROELECTRONICS

213 / 401 page

STR720 - CONTROLLER AREA NETWORK (CAN)

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Status Register (CAN_SR)

Address Offset: 04h

Reset value: 0000h

Reserved

LEC

Bit 15:8

Reserved

These are reserved bits. These bits are always read as ‘0’ and must always

be written with ‘0’.

Bit 7

BOff: Busoff Status

0: The CAN module is not in busoff state.

1: The CAN module is in busoff state.

Bit 6

EWarn: Warning Status

0: Both error counters are below the error warning limit of 96.

1: At least one of the error counters in the EML has reached the error

warning limit of 96.

Bit 5

EPass: Error Passive

0: The CAN Core is error active.

1: The CAN Core is in the error passive state as defined in the CAN

Specification.

Bit 4

RxOk: Received a Message Successfully

0: No message has been successfully received since this bit was last reset

by the CPU. This bit is never reset by the CAN Core.

1: A message has been successfully received since this bit was last reset

by the CPU (independent of the result of acceptance filtering).

Bit 3

TxOk: Transmitted a Message Successfully

0: Since this bit was reset by the CPU, no message has been successfully

transmitted. This bit is never reset by the CAN Core.

1: Since this bit was last reset by the CPU, a message has been

successfully (error free and acknowledged by at least one other node)

transmitted.

STR720 Datasheet(PDF) 213 Page - STMicroelectronics