L9805 datasheet(70/103 Pages) STMICROELECTRONICS

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L9805

CONTROLLER AREA NETWORK (Cont’d)

5.6.4.2 Paged Registers

LAST IDENTIFIER HIGH REGISTER (LIDHR)

Read/Write

Reset Value: Undefined

LID[10:3] are the most significant 8 bits of the last

Identifier read on the CAN bus.

LAST IDENTIFIER LOW REGISTER (LIDLR)

Read/Write

Reset Value: Undefined

LID[2:0] are the least significant 3 bits of the last

Identifier read on the CAN bus.

LRTR is the last Remote Transmission Request bit

read on the CAN bus.

LDLC[3:0] is the last Data Length Code read on the

CAN bus.

TRANSMIT ERROR COUNTER REG. (TECR)

Read Only

Reset Value: 00h

TEC[7:0] is the least significant byte of the 9-bit

Transmit Error Counter implementing part of the

fault confinement mechanism of the CAN protocol.

In case of an error during transmission, this counter

is incremented by 8. It is decremented by 1 after

every successful transmission. When the counter

value exceeds 127, the CAN controller enters the

error passive state. When a value of 256 is reached,

the CAN controller is disconnected from the bus.

RECEIVE ERROR COUNTER REG. (RECR)

Page: 00h — Read Only

Reset Value: 00h

REC[7:0] is the Receive Error Counter implement-

ing part of the fault confinement mechanism of the

CAN protocol. In case of an error during reception,

this counter is incremented by 1 or by 8 depending

on the error condition as defined by the CAN stand-

ard. After every successful reception the counter is

decremented by 1 or reset to 120 if its value was

higher than 128. When the counter value exceeds

127, the CAN controller enters the error passive

state.

IDENTIFIER HIGH REGISTERS (IDHRx)

Read/Write

Reset Value: Undefined

ID[10:3] are the most significant 8 bits of the 11-bit

message identifier.The identifier acts as the mes-

sage’s name, used for bus access arbitration and

acceptance filtering.

LID10

LID9

LID8

LID7

LID6

LID5

LID4

LID3

LID2

LID1

LID0

LRTR

LDLC3

LDLC2

LDLC1

LDLC0

TEC7

TEC6

TEC5

TEC4

TEC3

TEC2

TEC1

TEC0

REC7

REC6

REC5

REC4

REC3

REC2

REC1

REC0

ID10

ID9ID8

ID7ID6

ID5ID4

ID3

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