Rainbow-electronics T89C51CC01 Manual do Utilizador descarregar pdf (Página 97)

T89C51CC01

Rev. D – 17-Dec-01

No default value after reset

Table 55. CANSTCH Register

CANSTCH (S:B2h)

CAN message object Status

3-0 DLC3:0

Data length code

Number of bytes in the data field of the message.

The range of DLC is from 0 up to 8.

This value is updated when a frame is received (data or remote frame).

If the expected DLC differs from the incoming DLC, a warning appears in the

CANSTCH register.

Bit

Number

Bit

Mnemonic Description

76543210

DLCW TXOK RXOK BERR SERR CERR FERR AERR

Bit

Number

Bit

Mnemonic Description

7DLCW

Data length code warning

The incoming message does not have the DLC expected. Whatever the frame

type, the DLC field of the CANCONCH register is updated by the received DLC.

6TXOK

Transmit OK

The communication enabled by transmission is completed.

When the controller is ready to send a frame, if two or more message objects are

enabled as producers, the lower index message object (0 to 13) is supplied first.

This flag can generate an interrupt.

5RXOK

Receive OK

The communication enabled by reception is completed.

In the case of two or more message object reception hits, the lower index

message object (0 to 13) is updated first.

This flag can generate an interrupt.

4 BERR

Bit error (only in transmission)

The bit value monitored is different from the bit value sent.

Exceptions:

the monitored recessive bit sent as a dominant bit during the arbitration field and

the acknowledge slot detecting a dominant bit during the sending of an error

frame.

This flag can generate an interrupt.

3 SERR

Stuff error

Detectionofmorethanfiveconsecutivebitswiththesamepolarity.

This flag can generate an interrupt.

2CERR

CRC error

The receiver performs a CRC check on each destuffed received message from

thestartofframeuptothedatafield.

If this checking does not match with the destuffed CRC field, a CRC error is set.

This flag can generate an interrupt.

1 2 ... 92 93 94 95 96 97 98 99 100 101 102 ... 148 149

T89C51CC01 1

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