PC912XDP512F0MPVR datasheet(501/1348 Pages) FREESCALE

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Chapter 11 Serial Communication Interface (S12SCIV5)

MC9S12XDP512 Data Sheet, Rev. 2.21

Freescale Semiconductor

501

11.4.5.5

LIN Transmit Collision Detection

This module allows to check for collisions on the LIN bus.

Figure 11-18. Collision Detect Principle

If the bit error circuit is enabled (BERRM[1:0] = 0:1 or = 1:0]), the error detect circuit will compare the

transmitted and the received data stream at a point in time and ﬂag any mismatch. The timing checks run

when transmitter is active (not idle). As soon as a mismatch between the transmitted data and the received

data is detected the following happens:

•

The next bit transmitted will have a high level (TXPOL = 0) or low level (TXPOL = 1)

•

The transmission is aborted and the byte in transmit buffer is discarded.

•

the transmit data register empty and the transmission complete flag will be set

•

The bit error interrupt flag, BERRIF, will be set.

•

No further transmissions will take place until the BERRIF is cleared.

Figure 11-19. Timing Diagram Bit Error Detection

If the bit error detect feature is disabled, the bit error interrupt ﬂag is cleared.

NOTE

The RXPOL and TXPOL bit should be set the same when transmission

collision detect feature is enabled, otherwise the bit error interrupt ﬂag may

be set incorrectly.

TXD Pin

RXD Pin

LIN Physical Interface

Synchronizer Stage

Bus Clock

Receive Shift

Transmit Shift

LIN Bus

Compare

Sample

Bit Error

Point

Output Transmit

Shift Register

0123456789

Input Receive

Shift Register

BERRM[1:0] = 0:1

BERRM[1:0] = 1:1

Compare Sample Points

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