L9805E datasheet(87/125 Pages) STMICROELECTRONICS

87 / 125 page

L9805E

On-chip peripherals

87/125

ID[10:3] are the most significant 8 bits of the 11-bit message identifier.The identifier acts as

the message’s name, used for bus access arbitration and acceptance filtering.

IDENTIFIER LOW REGISTERS (IDLRx)

Read/Write

Reset Value: Undefined

ID[2:0] are the least significant 3 bits of the 11-bit message identifier.

RTR is the Remote Transmission Request bit. It is set to indicate a remote frame and reset

to indicate a data frame.

DLC[3:0] is the Data Length Code. It gives the number of bytes in the data field of the

message.The valid range is 0 to 8.

DATA REGISTERS (DATA0-7x)

Read/Write

Reset Value: Undefined

DATA[7:0] is a message data byte. Up to eight such bytes may be part of a message.

Writing to byte DATA7 initiates a transmit request and should always be done even when

DATA7 is not part of the message.

BUFFER CONTROL/STATUS REGs. (BCSRx)

Read/Write

Reset Value: 00h

Bit 3 = ACC Acceptance Code

Read Only

Set by hardware with the id of the highest priority filter which accepted the message stored

in the buffer.

ACC = 0: Match for Filter/Mask0. Possible match for Filter/Mask1.

ACC = 1: No match for Filter/Mask0 and match for Filter/Mask1.

Reset by hardware when either RDY or RXIF gets reset.

Bit 2 = RDY Message Ready

Read/Clear

Set by hardware to signal that a new error-free message is available (LOCK = 0) or that a

transmission request is pending (LOCK = 1).

Cleared by software when LOCK = 0 to release the buffer and to clear the corresponding

ID2

ID1

ID0

RTR

DLC3

DLC2

DLC1

DLC0

DATA7

DATA6

DATA5

DATA4

DATA3

DATA2

DATA1

DATA0

ACC

RDY

BUSY

LOCK

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