PIC16F877A TIMER1定时操作

心已赠人 2021-11-22 12:20 166阅读 0赞

/\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*  
Title:PIC16F877A TIMER1定时操作  
Author:hnrain  
Date:2010-12-28

使用前置分频器  
T1CKPS1  T1CKPS1    
   0        0        1  分频  TMR1时钟为晶振时钟/(4\*1)  
   0        1        2  分频  TMR1时钟为晶振时钟/(4\*2)  
   1        0        4  分频  TMR1时钟为晶振时钟/(4\*4)  
   1        1        8  分频  TMR1时钟为晶振时钟/(4\*8)  
   TMR1是16位宽度的TMR1由2个8位的可读写的寄存器TMR1H和TMR1L组成。

TMR1有专门的启停控制位TMR1ON，通过软件可以任意启动或暂停TMR1计数功能。

T1CON:TIMER1 CONTROL REGISTER

bit7-6 unimplemented :Read as ‘0’

bit5-4 T1CKPS1:T1CKPS0:Timer1 input Clock Prescale Select bits

11=1:8 prescale value

10=1:4 prescale value

01=1:2 prescale value

00=1:1 prescale value

bit3   T1OSCEN:Timer1 Oscillator Enable Control bit

1 = Oscillator is enable

0 = Oscillator is shut-off

bit2 T1SYNC:Timer1 External Clock Input Synchronization Control bit

when TMR1CS = 1

1= Do not synchronize external clock input

0= Synchronize external clock input

when TMR1CS = 0

This bit is ignored .Timer1 uses the internal clock when TMR1CS = 0.

bit1 TMR1CS:Timer1 Clock Source Select bit

1 = External clock from pin RC0/T1OSO/T1CKI

0 = Internal clock

bit0 TMR1ON:Timer1 on bit

1 = enables timer1

0 = stops timer1  
\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*/  
\#include <pic.h>  
\#include "../head/config.h"

\_\_CONFIG(HS&WDTDIS&LVPDIS&PWRTEN);

void Delayms(uint16 dly);

void main(void)  
\{  
    T1CKPS1 = 1;  
    T1CKPS0 = 1;  
    TMR1CS = 0;  
    TMR1L = (65536 - 37500)%256;  
    TMR1H = (65536 - 37500)/256;  
    GIE = 1;  
    PEIE = 1;  
    TMR1IE = 1;  
    TMR1ON = 1;     
    PORTD = 0x00;  
    TRISD = 0x00;  
    while(1)\{\}  
\}

void interrupt ISR(void)  
\{  
    TMR1L = (65536 - 37500)%256;  
    TMR1H = (65536 - 37500)/256;  
    if(TMR1IF&&TMR1IE)  
    \{  
        TMR1IF = 0;  
        PORTD = ~PORTD;  
    \}     
\}

/**********************
    Title:PIC16F877A TIMER1定时操作
    Author:hnrain
    Date:2010-12-28
    
    使用前置分频器
    T1CKPS1  T1CKPS1   
       0        0        1  分频  TMR1时钟为晶振时钟/(4*1)
       0        1        2  分频  TMR1时钟为晶振时钟/(4*2)
       1        0        4  分频  TMR1时钟为晶振时钟/(4*4)
       1        1        8  分频  TMR1时钟为晶振时钟/(4*8)
       
       TMR1是16位宽度的TMR1由2个8位的可读写的寄存器TMR1H和TMR1L组成。
    
    TMR1有专门的启停控制位TMR1ON，通过软件可以任意启动或暂停TMR1计数功能。
    
    
    
    T1CON:TIMER1 CONTROL REGISTER
    
    bit7-6 unimplemented :Read as ‘0’
    
    bit5-4 T1CKPS1:T1CKPS0:Timer1 input Clock Prescale Select bits
    
              11=1:8 prescale value
    
              10=1:4 prescale value
    
              01=1:2 prescale value
    
              00=1:1 prescale value
    
    bit3   T1OSCEN:Timer1 Oscillator Enable Control bit
    
             1 = Oscillator is enable
    
             0 = Oscillator is shut-off
    
    bit2 T1SYNC:Timer1 External Clock Input Synchronization Control bit
    
            when TMR1CS = 1
    
            1= Do not synchronize external clock input
    
            0= Synchronize external clock input
    
            when TMR1CS = 0
    
            This bit is ignored .Timer1 uses the internal clock when TMR1CS = 0.
    
    bit1 TMR1CS:Timer1 Clock Source Select bit
    
           1 = External clock from pin RC0/T1OSO/T1CKI
    
           0 = Internal clock
    
    bit0 TMR1ON:Timer1 on bit
    
         1 = enables timer1
    
         0 = stops timer1
    ***********************/
    #include <pic.h>
    #include "../head/config.h"
    
    __CONFIG(HS&WDTDIS&LVPDIS&PWRTEN);
    
    void Delayms(uint16 dly);
    
    void main(void)
    {
    	T1CKPS1 = 1;
    	T1CKPS0 = 1;
    	
    	TMR1CS = 0;
    	
    	TMR1L = (65536 - 37500)%256;
    	TMR1H = (65536 - 37500)/256;
    	
    	GIE = 1;
    	PEIE = 1;
    	TMR1IE = 1;
    	
    	TMR1ON = 1;	
    	
    	PORTD = 0x00;
    	TRISD = 0x00;
    	
    	while(1){}
    }
    
    void interrupt ISR(void)
    {
    	TMR1L = (65536 - 37500)%256;
    	TMR1H = (65536 - 37500)/256;
    	if(TMR1IF&&TMR1IE)
    	{
    		TMR1IF = 0;
    		PORTD = ~PORTD;
    	}	
    }

转载于:https://www.cnblogs.com/hnrainll/archive/2010/12/28/1919141.html