ZAMC4100GA2R datasheet(118/156 Pages) RENESAS

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ZAMC4100 Datasheet

118

January 26, 2016

4.9.2.

The BREAK/SYNC Field Detector

As described in the LIN standard, each transaction on the bus is initiated by the LIN master sending the header of

a LIN frame. This header consists of the BREAK field, the SYNC field, and the PID field. The first two fields are

used by the slave to determine the baud rate used for the rest of the transaction while the PID is used to

determine the type of the transaction (receive response; transmit response; do nothing). To enable the slave to

receive the PID, the baud rate must be detected before the START bit of the PID field. As a new BREAK and

SYNC field can occur at any time, an active transaction is interrupted when those fields are detected.

Figure 4.7 Structure of LIN Frame

FRAME

HEADER

RESPONSE

RESPONSE SPACE

BREAK

FIELD

SYNC

FIELD

PROTECTED

IDENTIFIER

FIELD

INTER-BYTE SPACE

DATA-1

DATA-2

DATA-N

CHECKSUM

INTER-BYTE SPACE

4.9.3.

SW-LIN Data Unit

The data unit handles the reception and transmission of bytes (PID, DATA, and CRC as described in the LIN

standard). It contains all registers accessible by the user and generates the interrupt (Figure 4.8).

Figure 4.8 Block Diagram of the LIN Data Unit

LINIRQEN

LINCFG

LINSTATUS

BAUDRATE

SHIFTREG

LINDATA

RxBUF

TxBUF

LIN

CONTROL

LOGIC

RXD

TXD

RXBIT

TXBIT

IRQ

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