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//******************************************************************************
// MSP430x47xx Demo - FLL+, LPM3 Using Basic Timer ISR, 32kHz ACLK
//
// Description: System runs normally in LPM3 with basic timer clocked by
// 32kHz ACLK. At a 2 second interval the basic timer ISR will wake the
// system and flash the LED on P5.1 inside of the Mainloop.
// ACLK = LFXT1 = 32768Hz, MCLK = SMCLK = default DCO = 32 x ACLK = 1048576Hz
// //* An external watch crystal between XIN & XOUT is required for ACLK *//
//
//
// MSP430x47xx
// ---------------
// /|\| XIN|-
// | | | 32kHz
// --|RST XOUT|-
// | |
// | P5.1|-->LED
//
// P. Thanigai / K.Venkat
// Texas Instruments Inc.
// November 2007
// Built with CCE Version: 3.2.0 and IAR Embedded Workbench Version: 3.42A
//******************************************************************************
#include <msp430x47x4.h>
void main(void)
{
WDTCTL = WDTPW + WDTHOLD; // Stop WDT
FLL_CTL0 |= XCAP14PF; // Configure load caps
IE2 |= BTIE; // Enable BT interrupt
BTCTL = BTDIV+BTIP2+BTIP1+BTIP0; // 2s Interrupt
P1DIR = 0xFF; // All P1.x outputs
P1OUT = 0; // All P1.x reset
P2DIR = 0xFF; // All P2.x outputs
P2OUT = 0; // All P2.x reset
P3DIR = 0xFF; // All P3.x outputs
P3OUT = 0; // All P3.x reset
P4DIR = 0xFF; // All P4.x outputs
P4OUT = 0; // All P4.x reset
P5DIR = 0xFF; // All P5.x outputs
P5OUT = 0; // All P5.x reset
PADIR = 0xFFFF; // All PA.x outputs
PAOUT = 0;
PBDIR = 0xFFFF; // All PB.x outputs
PBOUT = 0;
while(1)
{
volatile int i;
_BIS_SR(LPM3_bits + GIE); // Enter LPM3 w/ interrupts
P5OUT |= BIT1; // Set P5.1 LED on
for (i = 5000; i>0; i--); // Delay
P5OUT &= ~BIT1; // Clear P5.1 LED off
}
}
// Basic Timer interrupt service routine
#pragma vector=BASICTIMER_VECTOR
__interrupt void basic_timer(void)
{
_BIC_SR_IRQ(LPM3_bits); // Clear LPM3 bits from 0(SR)
}
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