胡斯哲 发表于 2013-6-13 22:21 
我用中断弄了 低频的怎么不好使 你说的脉冲捕捉怎么弄啊 - #include "reg51.h"
- #include "intrins.h"
- typedef unsigned char BYTE;
- typedef unsigned int WORD;
- /*Declare SFR associated with the PCA */
- sfr CCON = 0xD8; //PCA control register
- sbit CCF0 = CCON^0; //PCA module-0 interrupt flag
- sbit CCF1 = CCON^1; //PCA module-1 interrupt flag
- sbit CR = CCON^6; //PCA timer run control bit
- sbit CF = CCON^7; //PCA timer overflow flag
- sfr CMOD = 0xD9; //PCA mode register
- sfr CL = 0xE9; //PCA base timer LOW
- sfr CH = 0xF9; //PCA base timer HIGH
- sfr CCAPM0 = 0xDA; //PCA module-0 mode register
- sfr CCAP0L = 0xEA; //PCA module-0 capture register LOW
- sfr CCAP0H = 0xFA; //PCA module-0 capture register HIGH
- sfr CCAPM1 = 0xDB; //PCA module-1 mode register
- sfr CCAP1L = 0xEB; //PCA module-1 capture register LOW
- sfr CCAP1H = 0xFB; //PCA module-1 capture register HIGH
- sfr PCAPWM0 = 0xf2;
- sfr PCAPWM1 = 0xf3;
- sbit PCA_LED = P1^0; //PCA test LED
- void PCA_isr() interrupt 7 using 1
- {
- CCF0 = 0; //Clear interrupt flag
- PCA_LED = !PCA_LED; //toggle the test pin while CEX0(P1.3) have a falling edge
- }
- void main()
- {
- CCON = 0; //Initial PCA control register
- //PCA timer stop running
- //Clear CF flag
- //Clear all module interrupt flag
- CL = 0; //Reset PCA base timer
- CH = 0;
- CMOD = 0x00; //Set PCA timer clock source as Fosc/12
- //Disable PCA timer overflow interrupt
- CCAPM0 = 0x11; //PCA module-0 capture by a negative tigger on CEX0(P1.3) and enable PCA interrupt
- // CCAPM0 = 0x21; //PCA module-0 capture by a rising edge on CEX0(P1.3) and enable PCA interrupt
- // CCAPM0 = 0x31; //PCA module-0 capture by a transition (falling/rising edge) on CEX0(P1.3) and enable PCA interrupt
- CR = 1; //PCA timer start run
- EA = 1;
- while (1);
- }
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