ST72361AR4-Auto datasheet(162/279 Pages) STMICROELECTRONICS

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LINSCI serial communication interface (LIN master/slave)

ST72361xx-Auto

162/279

Doc ID 12468 Rev 3

When an overrun error occurs:

●

The OR bit is set.

●

The RDR content will not be lost.

●

The shift register will be overwritten.

●

An interrupt is generated if the RIE bit is set and the I[|1:0] bits are cleared in the CCR

The OR bit is reset by an access to the SCISR register followed by a SCIDR register read

operation.

Noise error

Oversampling techniques are used for data recovery by discriminating between valid

incoming data and noise.

When noise is detected in a character:

●

The NF bit is set at the rising edge of the RDRF bit.

●

Data is transferred from the shift register to the SCIDR register.

●

No interrupt is generated. However this bit rises at the same time as the RDRF bit

which itself generates an interrupt.

The NF bit is reset by a SCISR register read operation followed by a SCIDR register read

operation.

Framing error

A framing error is detected when:

●

The stop bit is not recognized on reception at the expected time, following either a

desynchronization or excessive noise.

●

A break is received.

When the framing error is detected:

●

the FE bit is set by hardware

●

Data is transferred from the shift register to the SCIDR register.

●

No interrupt is generated. However this bit rises at the same time as the RDRF bit

which itself generates an interrupt.

The FE bit is reset by a SCISR register read operation followed by a SCIDR register read

operation.

Break character

●

When a break character is received, the SCI handles it as a framing error. To

differentiate a break character from a framing error, it is necessary to read the SCIDR.

If the received value is 00h, it is a break character. Otherwise it is a framing error.

Conventional baud rate generation

The baud rates for the receiver and transmitter (Rx and Tx) are set independently and

calculated as follows:

Tx =

(16*PR)*TR

fCPU

Rx =

(16*PR)*RR

fCPU

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