This program is based on the internal timer B interrupt experiment of MSP430 single chip. Function: Use timer B to accurately set the time interval of the running light.
#include "MSP430F149.h"
#define uchar unsigned char
#define uint unsigned int
uchar LedData=0x80;
uchar num=50;//Interrupt 50 times to shift the LED right by one position
//Timer A initialization
void InitTimerB(){
TBCTL=TBSSEL1+ID1+ID0+MC0+TBCLR;//Select 1/8SMCLK to clear TAR
TBCCTL0=CCIE;//CCR0 interrupt enables comparison mode
TBCCR0=10000;//Time interval 10ms
}
//Timer A interrupt
#pragma vector =TIMERB0_VECTOR
__interrupt void TimerBINT(){
num--;
if(num==0){
LedData>>=1;//Shift right one bit
if(LedData==0x00) LedData=0x80;
P4OUT=LedData;//P4 port output data
num=50;//50 interrupts is 0.5s
}
}
void main(){
InitClock();//Initialize clock
InitTimerB();//Timer B initialization
P4DIR=0xFF;//P4 port output direction
_EINT();//Open interrupt
while(1);
}
Keywords：MSP430
Reference address：MSP430 MCU Timer B Interrupt Experiment
#include "MSP430F149.h"
#define uchar unsigned char
#define uint unsigned int
uchar LedData=0x80;
uchar num=50;//Interrupt 50 times to shift the LED right by one position
//Timer A initialization
void InitTimerB(){
TBCTL=TBSSEL1+ID1+ID0+MC0+TBCLR;//Select 1/8SMCLK to clear TAR
TBCCTL0=CCIE;//CCR0 interrupt enables comparison mode
TBCCR0=10000;//Time interval 10ms
}
//Timer A interrupt
#pragma vector =TIMERB0_VECTOR
__interrupt void TimerBINT(){
num--;
if(num==0){
LedData>>=1;//Shift right one bit
if(LedData==0x00) LedData=0x80;
P4OUT=LedData;//P4 port output data
num=50;//50 interrupts is 0.5s
}
}
void main(){
InitClock();//Initialize clock
InitTimerB();//Timer B initialization
P4DIR=0xFF;//P4 port output direction
_EINT();//Open interrupt
while(1);
}
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