L9803 datasheet(83/126 Pages) STMICROELECTRONICS

83 / 126 page

L9803

On-Chip Peripherals

83/126

Bit 4 = TXIE Transmit Interrupt Enable

− Read/Set/Clear

Set by software to enable an interrupt request whenever a message has been successfully

transmitted.

Cleared by software to disable transmit interrupt requests.

Bit 3 = SCIE Status Change Interrupt Enable

− Read/Set/Clear

Set by software to enable an interrupt request whenever the node’s status changes in run

mode or whenever a dominant pulse is received in standby mode.

Cleared by software to disable status change interrupt requests.

Bit 2 = ORIE Overrun Interrupt Enable

− Read/Set/Clear

Set by software to enable an interrupt request whenever a message should be stored and

no receive buffer is avalaible.

Cleared by software to disable overrun interrupt requests.

Bit 1 = TEIE Transmit Error Interrupt Enable

− Read/Set/Clear

Set by software to enable an interrupt whenever an error has been detected during

transmission of a message.

Cleared by software to disable transmit error interrupts.

Bit 0 = ETX Early Transmit Interrupt

− Read/Set/Clear

Set by software to request the transmit interrupt to occur as soon as the arbitration phase

has been passed successfully.

Cleared by software to request the transmit interrupt to occur at the completion of the

transfer.

CONTROL/STATUS REGISTER (CSR)

Read/Write

Reset Value: 00h

Bit 6 = BOFF Bus-Off State

− Read Only

Set by hardware to indicate that the node is in bus-off state, i.e. the Transmit Error Counter

exceeds 255.

Reset by hardware to indicate that the node is involved in bus activities.

Bit 5 = EPSV Error Passive State

− Read Only

Set by hardware to indicate that the node is error passive.

Reset by hardware to indicate that the node is either error active (BOFF = 0) or bus-off.

Bit 4 = SRTE Simultaneous Receive/Transmit Enable

− Read/Set/Clear

Set by software to enable simultaneous transmission and reception of a message passing

the acceptance filtering. Allows to check the integrity of the communication path.

BOFF

EPSV

SRTE

NRTX

FSYN

WKPS

RUN

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