ATtiny167-ESSZ datasheet(278/282 Pages) ATMEL

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278

7728D–AVR–07/09

ATtiny87/ATtiny167

29. Errata

29.1

Errata Summary

29.1.1

ATtiny87/167 RevB (Date code >1208)

• Gain control of the crystal oscillator.

•‘Disable Clock Source’ command remains enabled.

29.1.2

ATtiny167 RevA (Date code >1207)

• CRC calculation of diagnostic frames in LIN 2.x.

• Gain control of the crystal oscillator.

•‘Disable Clock Source’ command remains enabled.

• Comparison between ADC inputs and voltage references.

• Register bits of DIDR1.

29.2

Errata Description

CRC calculation of diagnostic frames in LIN 2.x.

Diagnostic frames of LIN 2.x use “classic checksum” calculation. Unfortunately, the setting

of the checksum model is enabled when the HEADER is transmitted/received. Usually, in

LIN 2.x the LIN/UART controller is initialized to process “enhanced checksums” and a

slave task does not know what kind of frame it will work on before checking the ID.

Problem fix / workaround.

This workaround is to be implemented only in case of transmission/reception of diagnostic

frames.

Slave task of master node:

Before enabling the HEADER, the master must set the appropriate LIN13 bit value in

LINCR register.

For slaves nodes, the workaround is in 2 parts:

– Before enabling the RESPONSE, use the following function:

void lin_wa_head(void) {

unsigned char temp;

temp = LINBTR;

LINCR = 0x00;

// It is not a RESET !

LINBTR = (1<<LDISR)|temp;

LINCR

= (1<<LIN13)|(1<<LENA)|(0<<LCMD2)|(0<<LCMD1)|(0<<LCMD0);

LINDLR = 0x88;

// If it isn't already done

}

– Once the RESPONSE is received or sent (having RxOK or TxOK as well as

LERR), use the following function:

void lin_wa_tail(void)

{

LINCR = 0x00;

// It is not a RESET !

LINBTR = 0x00;

LINCR

= (0<<LIN13)|(1<<LENA)|(0<<LCMD2)|(0<<LCMD1)|(0<<LCMD0);

}

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