Timer_A is configured // for up mode with CCR0 defining period, TA0 also output on P1.1.. No CPU or software // resources required.. Normal operating mode is LPM3.. Dang // Texas Instrum
Trang 1//****************************************************************************** // MSP430G2xx1 Demo - Timer_A, Toggle P1.1/TA0, Up Mode, 32kHz ACLK
//
// Description: Toggle P1.1 using hardware TA0 output Timer_A is configured // for up mode with CCR0 defining period, TA0 also output on P1.1 In this // example, CCR0 is loaded with 10-1 and TA0 will toggle P1.1 at TACLK/10 // Thus the output frequency on P1.1 will be the TACLK/20 No CPU or software // resources required Normal operating mode is LPM3
// ACLK= TACLK = 32kHz, MCLK = default DCO
// As coded with TACLK = ACLK, P1.1 output frequency = 32768/20 = 1.6384kHz // //* External watch crystal installed on XIN XOUT is required for ACLK *// //
// MSP430G2xx1
//
-// /|\|
XIN|-// | | | 32kHz
// |RST
XOUT|-// | |
// | P1.1/TA0| > ACLK/20
//
// D Dang
// Texas Instruments Inc
// October 2010
// Built with CCS Version 4.2.0 and IAR Embedded Workbench Version: 5.10
//******************************************************************************
#include <msp430g2231.h>
void main(void)
{
WDTCTL = WDTPW + WDTHOLD; // Stop WDT
P1DIR |= 0x02; // P1.1 output
P1SEL |= 0x02; // P1.1 option select
CCTL0 = OUTMOD_4; // CCR0 toggle mode
CCR0 = 10-1;
TACTL = TASSEL_1 + MC_1; // ACLK, upmode
_BIS_SR(LPM3_bits); // Enter LPM3 w/interrupt
}