Непонятки с прерываниями M430F2122 Опции

[rabbit-dj]

Имеется следующая программка:

CODE

int __low_level_init(void)
{
int res=0;
WDTCTL = WDTPW +WDTHOLD; // Stop Watchdog Timer
if (CALBC1_8MHZ ==0xFF || CALDCO_8MHZ == 0xFF)
{
while(1); // If calibration constants erased
// do not load, trap CPU!!
}
BCSCTL1 = CALBC1_8MHZ; // Set DCO to 8MHz
DCOCTL = CALDCO_8MHZ;
//------ Èíèöèàëèçàöèÿ USART â ðåæèìå I2C -----------------
P3SEL |= 0x06; // Assign I2C pins to USCI_B0
UCB0CTL1 |= UCSWRST; // Enable SW reset
UCB0CTL0 = UCMODE_3 + UCSYNC; // I2C Slave, synchronous mode
UCB0I2COA = 0x48; // Own Address is 048h
UCB0CTL1 &= ~UCSWRST; // Clear SW reset, resume operation
UCB0I2CIE |= UCSTPIE + UCSTTIE; // Enable STT and STP interrupt
IE2 |= UCB0RXIE; // Enable RX interrupt
//------ Èíèöèàëèçàöèÿ TIMER_B ---------
TA1CCR0 = 30000;
TA1CTL = TASSEL_2 + MC_1; // SMCLK, upmode
TA1CCTL1 |= CCIE; // TACCR0 interrupt enabled

//---------------------------------------------------------
__enable_interrupt(); // Ãëîáàëüíîå ðàçðåøåíèå ïðåðûâàíèé
return 0;
}
//===========================================================
int main( void )
{

while (1)
{
PRxData = (unsigned char *)RxBuffer; // Start of RX buffer

if(RxComplete == 1)
{
RxComplete = 0;
write_flash(RxBuffer);
RXByteCtr = 0;
}
__bis_SR_register(LPM0_bits + GIE); // Enter LPM0 w/ interrupt
}
}
//------------------------------------------------------------------------------
// The USCI_B0 data ISR is used to move received data from the I2C master
// to the MSP430 memory.
//------------------------------------------------------------------------------
#pragma vector = USCIAB0TX_VECTOR
__interrupt void USCIAB0TX_ISR(void)
{
*PRxData++ = UCB0RXBUF; // Move RX data to address PRxData
RXByteCtr++; // Increment RX byte count

}
//------------------------------------------------------------------------------
// The USCI_B0 state ISR is used to wake up the CPU from LPM0 in order to
// process the received data in the main program. LPM0 is only exit in case
// of a (re-)start or stop condition when actual data was received.
//------------------------------------------------------------------------------
#pragma vector = USCIAB0RX_VECTOR
__interrupt void USCIAB0RX_ISR(void)
{
UCB0STAT &= ~(UCSTPIFG + UCSTTIFG); // Clear interrupt flags
if (RXByteCtr) // Check RX byte counter
{
RxComplete = 1;
__bic_SR_register_on_exit(CPUOFF); // Exit LPM0 if data was
}
}
//=============================================================
#pragma vector=TIMER1_A1_VECTOR
__interrupt void TIMERA1_isr( void ) //
{

}
//======================= Çàïèñü âî ôëýø ========================
void write_flash(volatile unsigned int *Data)
{
unsigned int *Flash_ptr; // Flash pointer
char i;

Flash_ptr = (unsigned int *)SegOfData; // Initialize Flash pointer
FCTL3 = FWKEY; // Clear Lock bit
FCTL1 = FWKEY + ERASE; // Set Erase bit
*Flash_ptr = 0; // Dummy write to erase Flash seg
FCTL1 = FWKEY + WRT; // Set WRT bit for write operation
for (i = 0; i < 32; i++)
{
*Flash_ptr++ = Data[i]; // Write value to flash
}
FCTL1 = FWKEY; // Clear WRT bit
FCTL3 = FWKEY + LOCK; // Set LOCK bit

}

В ней ведется прием по шине I2C и работает интервальный таймер. Проблема в том, что при разрешенном прерывании от таймера прерывания от модуля USCI игнорируются. Если отключить таймер, прием идет нормально. Объясните чайнику, в чем загвоздка?