Timer_A is configured // for up mode with CCR0 defining period, TA0 also output on P1.1.. No CPU or // software resources required.. Dang // Texas Instruments Inc.
Trang 1//****************************************************************************** // MSP430G2xx2 Demo - Timer_A, Toggle P1.1/TA0, Up Mode, DCO SMCLK
//
// 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 500-1 and TA0 will toggle P1.1 at TACLK/500 // Thus the output frequency on P1.1 will be the TACLK/1000 No CPU or
// software resources required
// ACLK = n/a, SMCLK = MCLK = TACLK = default DCO
// As coded with TACLK = SMCLK, P1.1 output frequency is ~1000000/1000
//
// MSP430G2xx2
//
-// /|\|
XIN|-// | | |
// |RST
XOUT|-// | |
// | P1.1/TA0| > SMCLK/1000
//
// D Dang
// Texas Instruments Inc
// December 2010
// Built with CCS Version 4.2.0 and IAR Embedded Workbench Version: 5.10
//******************************************************************************
#include <msp430g2452.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 = 500-1;
TACTL = TASSEL_2 + MC_1; // SMCLK, upmode
_BIS_SR(CPUOFF); // CPU off
}