求stc单片机的PCA定时器程序！！！

Question

有程序最好，，我调了好久都没跳出来！！没有的话求高手解答！！！CCAP0H=0x78; //PCA定时器寄存器值，50ms,7.3728MHz这是什么意思！！

Answer 1

/* --- 演示 STC 1T 系列单片机 用PCA功能实现16位定时器 --------*/
#include "reg51.h"
#include "intrins.h"
#define FOSC 18432000L
#define T100Hz (FOSC / 12 / 100)
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
BYTE cnt;
WORD value;
void PCA_isr() interrupt 7 using 1
{
CCF0 = 0; //Clear interrupt flag
CCAP0L = value;
CCAP0H = value >> 8; //Update compare value
value += T100Hz;
if (cnt-- == 0)
{
cnt = 100; //Count 100 times
PCA_LED = !PCA_LED; //Flash once per second
}
}
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
value = T100Hz;
CCAP0L = value;
CCAP0H = value >> 8; //Initial PCA module-0
value += T100Hz;
CCAPM0 = 0x49; //PCA module-0 work in 16-bit timer mode
//and enable PCA interrupt
CR = 1; //PCA timer start run
EA = 1;
cnt = 0;
while (1);
}