/********************** Title:PIC16F877A TIMER1计数操作 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 说明：作用在TMR1的计数状态，计数信号从RC0/T1CKI输入， 当来一个上升沿时，采集到一个有效的信号，计数到TMR1L,TMR1H中。 当计满时就会产生中断信号。 ***********************/ #include <pic.h> #include "../head/config.h"
__CONFIG(HS&WDTDIS&LVPDIS&PWRTEN);
void main(void) { T1CKPS0 = 0; T1CKPS1 = 0;//不分频
TMR1L = (65536 - 1)%6;//TMR1L,TMR1H赋初值 TMR1H = (65536 - 1)/256; T1SYNC = 1;//TMR1异步计数器 TMR1CS = 1; GIE = 1;//打开全局中断 PEIE = 1;//打开外部中断 TMR1IE = 1;//TMR1中断打开 TMR1ON = 1; PORTD = 0x00; TRISD = 0x00; while(1){} }
void interrupt ISR(void) { TMR1L = (65536 - 1)%6;//重新赋值 TMR1H = (65536 - 1)/256; if(TMR1IE && TMR1IF) { TMR1IF = 0; PORTD = ~PORTD; } }
/********************** Title:PIC16F877A TIMER1计数操作 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 说明：作用在TMR1的计数状态，计数信号从RC0/T1CKI输入， 当来一个上升沿时，采集到一个有效的信号，计数到TMR1L,TMR1H中。 当计满时就会产生中断信号。 ***********************/ #include <pic.h> #include "../head/config.h" __CONFIG(HS&WDTDIS&LVPDIS&PWRTEN); void main(void) { T1CKPS0 = 0; T1CKPS1 = 0;//不分频 TMR1L = (65536 - 1)%6;//TMR1L,TMR1H赋初值 TMR1H = (65536 - 1)/256; T1SYNC = 1;//TMR1异步计数器 TMR1CS = 1; GIE = 1;//打开全局中断 PEIE = 1;//打开外部中断 TMR1IE = 1;//TMR1中断打开 TMR1ON = 1; PORTD = 0x00; TRISD = 0x00; while(1){} } void interrupt ISR(void) { TMR1L = (65536 - 1)%6;//重新赋值 TMR1H = (65536 - 1)/256; if(TMR1IE && TMR1IF) { TMR1IF = 0; PORTD = ~PORTD; } }
转载于:https://www.cnblogs.com/hnrainll/archive/2010/12/28/1919168.html
