#pragma pack(1)
typedef struct
{
unsigned char Length;
unsigned char Cmd;
unsigned char ADC1[ADCBUFSISE]; // ADCBUFSISE == 18
unsigned char ADC2[ADCBUFSISE];
unsigned char ADC3[ADCBUFSISE];
unsigned char crc_h;
unsigned char crc_l;
} Response_str;
#pragma pack()


Response_str TransmisionFrame;
unsigned char *pUart0_tx_pointer;


void USART0_Transmit( unsigned char data ) {
/* Wait for empty transmit buffer */
while ( !( UCSR0A & (1<<UDRE0)) );
/* Put data into buffer, sends the data */
UDR0 = data;
}


// инициирую отправку пакета раз в 2 секунды, пакет отправляется 2 мс, по этому период огромен
void main( void ) {
while(1) {
pUart0_tx_pointer = &TransmisionFrame.Cmd;
USART0_Transmit( TransmisionFrame.Length );
__delay_cycles(8000000*8);

}
}


// прерывание
// USART0 Transmitter interrupt service routine
#pragma vector=(0x36*0x02)
__interrupt void USART0_TXC_isr(void) { //

if( pUart0_tx_pointer <= &TransmisionFrame.crc_l ) {
UDR0 = *pUart0_tx_pointer++;
}
}

223A0000000000000000000000000000000000000000000000000000000000000000000000000000
00000000000000000000000000000000A55A - верный пакет
1A606908A5019746581A058A58A58199C65F1A606908A5019746581A058A58A58199C65F1A606908
A5019746581A058A58A58199C65F1A606908 - лажа
1A626910A52197C6581A078A64A5A19906601A626910A52197C6581A078A64A5A19906601A626910
A52197C6581A078A64A5A19906601A626910 - лажа

while( 1 )
  {
    pUart0_tx_pointer = &TransmisionFrame.Cmd;
    USART0_Transmit( TransmisionFrame.Length );  
    __delay_cycles(8000000*8);
    memset( &TransmisionFrame, 0xAA, sizeof(TransmisionFrame) );    
  }

223A0000000000000000000000000000000000000000000000000000000000000000000000000000
00000000000000000000000000000000A55A
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AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA