msp430fr5969 使用32K外部晶振定时唤醒LPM3,官方例程。

2019-03-24 10:52发布

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* MSP430 CODE EXAMPLE DISCLAIMER
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* MSP430 code examples are self-contained low-level programs that typically
* demonstrate a single peripheral function or device feature in a highly
* concise manner. For this the code may rely on the device's power-on default
* register values and settings such as the clock configuration and care must
* be taken when combining code from several examples to avoid potential side
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* for an API functional library-approach to peripheral configuration.
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//******************************************************************************
// MSP430FR59x Demo - TimerB, Toggle P1.0, CCR0 UP Mode ISR, 32KHz ACLK
//
// Description: Toggle P1.0 using software and TB ISR. TimerB is
// configured for UP mode, thus the timer overflows when TBR counts
// to CCR0.
// ACLK = TACLK = 32768Hz, MCLK = SMCLK = default DCO = ~1MHz
//
//
// MSP430FR5969
// ---------------
// /|| |
// | | |
// --|RST |
// | |
// | P1.0|-->LED
//
// T. Witt/ P. Thanigai
// August 2012
// Built with IAR Embedded Workbench V5.30 & Code Composer Studio V5.2
//******************************************************************************
#include <msp430.h>
int main(void)
{
WDTCTL = WDTPW | WDTHOLD; // Stop WDT
// XT1 Setup
PJSEL0 |= BIT4 + BIT5;
CSCTL0_H = 0xA5;
CSCTL2 = SELA_0 + SELS_3 + SELM_3; // set ACLK = XT1; MCLK = DCO
CSCTL3 = DIVA_0 + DIVS_0 + DIVM_0; // set all dividers
CSCTL4 |= LFXTDRIVE_0;
CSCTL4 &= ~LFXTOFF;
do
{
CSCTL5 &= ~LFXTOFFG;
// Clear XT1 fault flag
SFRIFG1 &= ~OFIFG;
}while (SFRIFG1&OFIFG); // Test oscillator fault flag
P1DIR |= BIT0; // LED interrupt
P1OUT |= BIT0;
TB0CCTL0 = CCIE; // TBCCR0 interrupt enabled
TB0CCR0 = 50000;
TB0CTL = TBSSEL_1 + MC_1; // ACLK, continuous mode
__bis_SR_register(LPM3_bits + GIE); // Enter LPM3 w/ interrupt
}
// Timer B1 interrupt service routine
#pragma vector = TIMER0_B0_VECTOR
__interrupt void Timer0_B0_ISR(void)
{
P1OUT ^= BIT0;
}