TLE9255WLC datasheet(50/100 Pages) INFINEON

50 / 100 page

Data Sheet

Rev. 1.02 2018-02-02

TLE9255W

Serial Peripheral Interface

8.3

Status Information Field

The Status Information Field informs the microcontroller that status register bits have changed. The Status

Information Field is returned during each SPI write or read command in the MISO format frame. Each bit of the

Status Information Field represents an OR operation of some bits of a specific status register. If an SPI access

occurs while the status register is being updated due to an event, the content of the Status Information Field

may not reflect the latest state of the status registers. Table 4 defines the content of the Status Information

Field.

The ERR_STAT is flagged on the MISO pin.

8.4

SPI Failure

The SPI bit COM_ERR signals an SPI failure. Any of the following conditions define the SPI failure:

• Register address does not exist

• Number of received SPI clocks is neither 0 nor 16

On SPI failure SPI commands are ignored.

8.5

Invalid SPI Command

Any attempt to write undefined bit combinations to one of the following SPI registers is an invalid SPI

command.

• Mode of the register MODE_CTRL

• TXD_TO of the register TXD_TO_CTRL

• BR_RATIO of the register SWK_CTRL_2

• BR of the register SWK_CTRL_2

• VIO_UV_T of the register SUPPLY_CTRL

• VCC_UV_T of the register SUPPLY_CTRL

An invalid SPI command is ignored and the CMD_ERR bit is set and signalled on the MISO pin. Only the

microcontroller can reset the CMD_ERR bit.

Table 4

Status Information Field

Name

Bit Position

Reflected Bits

Reserved

TRANS_UV_STAT (Transceiver

undervoltage status)

VBAT_UV OR VCC_LTUV OR VCC_STUV OR VIO_LTUV

OR VIO_STUV

TEMP_STAT (Temperature status)

TSD OR Reserved

WAKE_STAT (Wake-up status)

LWU OR WUP OR WUF

TXD_TO (TxD timeout)

TXD_TO

CANSIL (CAN Silence)

CANSIL

POR (Power on Reset)

POR

ERR_STAT (Error status)

CMD_ERR or COM_ERR

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