📄 test44x_tb04.c
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//******************************************************************************
// MSP430-TEST44X Demo - Timer_B Toggle P5.1, overflow ISR, 32kHz ACLK
//
// Description; Toggle P5.1 using using software and the timer_B overflow ISR.
// In this example an ISR will trigger when TB overflows. Inside the ISR P5.1
// is toggled. Toggle rate is exactly 0.25hz.
// Proper use of TBIV interrupt vector generator demonstrated.
// ACLK = TBCLK = LFXT1 = 32768, MCLK = SMCLK = DCO = 32xACLK = 1.048576MHz
// //*An external watch crystal on XIN XOUT is required for ACLK*//
//
// MSP430F449
// ---------------
// /|\| XIN|-
// | | | 32kHz
// --|RST XOUT|-
// | |
// | P5.1|-->LED
//
// zhangchong
// Lierda, Inc
// February 2006.03
// Built with IAR Embedded Workbench Version: 3.40a
// ID: MSP430-TEST44X
// DATA:2005-7-12
// REV: 2.0A
// 程序功能:该程序是用F449的内部TIMER_B CCR0的比较模式功能,来控制P5.1口驱动LED 2s(65536/32.768)闪烁。
// 硬件连接:先连接P5.1口的短接器,然后连接键盘上方的短接器J2。
//
//******************************************************************************
#include <msp430x44x.h>
void main(void)
{
WDTCTL = WDTPW + WDTHOLD; // Stop WDT
FLL_CTL0 |= XCAP14PF; // Configure load caps
TBCTL = TBSSEL0 + TBCLR + TBIE; // ACLK, clr. TBR, interrupt
P5DIR |= 0x02; // Set P5.1 to output direction
TBCTL |= MC1; // Start Timer_B in continous
_EINT(); // Enable interrupts
for (;;)
{
_BIS_SR(LPM3_bits); // Enter LPM3
_NOP(); // Required only for C-spy
}
}
// Timer_B7 Interrupt Vector (TBIV) handler
//interrupt [TIMERB1_VECTOR] void Timer_B(void)
#pragma vector=TIMERB1_VECTOR
__interrupt void Timer_B (void)
{
switch( TBIV )
{
case 2: break; // CCR1 not used
case 4: break; // CCR2 not used
case 14: P5OUT ^= 0x02; // overflow
break;
}
}
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