PWM in PCA

Hello all,

I am working with AT89C51CC01. My task is to get PWM as o/p, for this i write the following code. please check this code.

void main()
{
CMOD = 0x02; // Setup PCA timer

CL = 0x00;
CH = 0x00;

CCAPM0 = 0x42; // Setup PCA module 0 in PWM mode.

CCAP0L = 0x00; // Set the initial value same as CCAP0H
CCAP0H = 0x80; // 50% Duty Cycle 128d

CR = 1; // Start PCA Timer.

while (1)
{}
}

I test this program last weeek, at that time it gives pwm as o/p but when i test this today then it´s not working.
I don´t understand wht is the problem?
If any one have idea abt this problem then please reply me

thanks in advance.