33911 datasheet(36/45 Pages) FREESCALE

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Analog Integrated Circuit Device Data

Freescale Semiconductor

33911

FUNCTIONAL DEVICE OPERATIONS

LOGIC COMMANDS AND REGISTERS

LIN Control Register - LINCR

This register controls the LIN physical interface block.

Writing the LIN Control Register (LINCR) returns the LIN

Status Register (LINSR).

* LIN failure gone: if LIN failure (overtemp, TxD/RxD short) was set, the flag

resets automatically when the failure is gone.

LDVS - LIN Dominant Voltage Select

This write-only bit controls the LIN Dominant voltage:

1 = LIN Dominant Voltage = VLIN_DOM_1 (1.7V typ)

0 = LIN Dominant Voltage = VLIN_DOM_0 (1.1V typ)

RXONLY - LIN Receiver Operation Only.

This write-only bit controls the behavior of the LIN

transmitter.

In Normal mode the activation of the RXONLY bit disables

the LIN transmitter. In case of a LIN error condition this bit is

automatically set.

In Stop Mode this bit disables the LIN wake-up

functionality and the RXD pin will reflect the state of the LIN

bus.

1 = only LIN receiver active (Normal Mode) or LIN wake-

up disabled (Stop Mode).

0 = LIN fully enabled.

LSRx - LIN Slew-Rate

This write-only bit controls the LIN driver slew-rate in

accordance with Table 15.

Table 15. LIN Slew-Rate Control

LIN Status Register - LINSR

This register returns the status of the LIN physical

interface block and is also returned when writing to the LIN

Control Register (LINCR).

RXSHORT - RXD Short-circuit

This read-only bit indicates a short-circuit condition on

RXD (shorted either to 5.0V or to Ground). The short-circuit

delay must be 8µs worst case to be detected and to shutdown

the driver. To clear this bit, it must be read after the condition

is gone (transition detected on RXD). The LIN driver is

automatically re-enabled once the condition is gone.

1 = RxD short-circuit condition.

0 = None.

TXDOM - TXD Permanent Dominant

This read-only bit signals the detection of a TXD pin stuck

at dominant (Ground) condition and the resultant shutdown in

the LIN transmitter. This condition is detected after the TXD

pin remains in dominant state for more than 1 second typical

value.

To clear this bit, it must be read after TXD has gone high.

The LIN driver is automatically re-enabled once TXD goes

high.

1 = TXD stuck at dominant fault detected.

0 = None.

LINOT - LIN Driver Over-temperature Shutdown

This read-only bit signals that the LIN transceiver was

shut-down due to over-temperature. The transmitter is

automatically re-enabled after the over-temperature

condition is gone and TXD is high. The LINOT bit is cleared

after SPI read once the condition is gone.

1 = LIN over-temperature shutdown

0 = None

LINOC - LIN Driver Over-current Shutdown

This read-only bit signals an over-current condition

occurred on the LIN pin. The LIN driver is not shut down but

an IRQ is generated. To clear this bit, it must be read after the

condition is gone.

1 = LIN over-current shutdown

0 = None

Table 14. LIN Control Register - $4

Write

LDVS

RXONLY

LSR1

LSR0

Reset

Value

Reset

Condition

POR, Reset

Mode or

ext_reset

POR, Reset

Mode, ext_reset

or LIN failure

gone*

POR

LSR1

LSR0

Description

Normal Slew-Rate (up to 20kb/s)

Slow Slew-Rate (up to 10kb/s)

Fast Slew-Rate (up to 100kb/s)

Reserved

Table 16. LIN Status Register - $4/$5

Read

RXSHORT

TXDOM

LINOT

LINOC

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