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型號(hào)：	UPD703270GF-XXX-JBT
元件分類：	微控制器/微處理器
英文描述：	32-BIT, MROM, 20 MHz, RISC MICROCONTROLLER, PQFP100
封裝：	14 X 20 MM, PLASTIC, QFP-100
文件頁(yè)數(shù)：	765/1080頁(yè)
文件大小：	6965K
代理商：	UPD703270GF-XXX-JBT

CHAPTER 19 CAN CONTROLLER

User’s Manual U16541EJ4V0UD

(4) Error state

(a) Types of error states

The following three types of error states are defined by the CAN specification.

Error active

Error passive

These types of error states are classified by the values of the C0ERC.TEC7 to C0ERC.TEC0 bits

(transmission error counter bits) and the C0ERC.REC6 to C0ERC.REC0 bits (reception error counter bits)

as shown in Table 19-13.

The present error state is indicated by the C0INFO register.

When each error counter value becomes equal to or greater than the error warning level (96), the

C0INFO.TECS0 or C0INFO.RECS0 bit is set to 1. In this case, the bus state must be tested because it is

considered that the bus has a serious fault. An error counter value of 128 or more indicates an error

passive state and the TECS1 or RECS1 bit is set to 1.

If the value of the transmission error counter is greater than or equal to 256 (actually, the transmission

error counter does not indicate a value greater than or equal to 256), the bus-off state is reached and

the C0INFO.BOFF bit is set to 1.

If only one node is active on the bus at startup (i.e., when the bus is connected only to the local station),

ACK is not returned even if data is transmitted. Consequently, re-transmission of the error frame and

data is repeated. In the error passive state, however, the transmission error counter is not incremented

and the bus-off state is not reached.

Table 19-13. Types of Error States

Value of Error

Indication of C0INFO

Operation Specific to Error State

Transmission

TECS1, TECS0 = 00

RECS1, RECS0 = 00

Transmission

TECS1, TECS0 = 01

Error active

RECS1, RECS0 = 01

Outputs an active error flag (6 consecutive dominant-

level bits) on detection of the error.

Transmission

TECS1, TECS0 = 11

Error passive

RECS1, RECS0 = 11

Outputs a passive error flag (6 consecutive

recessive-level bits) on detection of the error.

Transmits 8 recessive-level bits, in between

transmissions, following an intermission (suspend

transmission).

Transmission

(not indicated)

TECS1, TECS0 = 11

Communication is not possible.

When the frame is received, no messages are stored

and the following operations are performed.

<1> TSOUT toggles.

<2> REC is incremented/decremented.

<3> VALID bit is set.

If the initialization mode is set and then 11 recessive-

level bits are generated 128 times in a row in an

operation mode other than the initialization mode,

the error counter is reset to 0 and the error active

state can be restored.

The value of the transmit error counter (TEC) does not carry any meaning if BOFF has been set. If an error

that increments the value of the transmission error counter by 8 while the counter value is in a range of 248 to

255 occurs, the counter is not incremented and the bus-off state is assumed.

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