Example PWM

Hi,
I was trying to configure the CEX3 of Atmel TSC80251G2D( 80C251). Here follows my initialization code. I dont see a PWM output.
Any one has any comments? If so please help.

void pca_configure()
{
CMOD = 0x0; /* Internal Clock */
CCAPM3 = 0x42; /* PWM ON */
CCAP3H = 128; /* Duty cycle value for 50% */
CCAP3L = 128; /* Duty cycle value for 50% */
IPL0 = 0x40; /* Make PCA interrupt the highest priority */
IPH0 = 0x40; /* Make PCA interrupt the highest priority */

CR = 1; /* Start running */
EC = 1; /* PCA interrupt enable */
EA = 1; /* /* Global interrupt enable */
}


Thanks and Regards
Arun

Hi,
I was trying to configure the CEX3 of Atmel TSC80251G2D( 80C251). Here follows my initialization code. I dont see a PWM output.
Any one has any comments? If so please help.

void pca_configure()
{
CMOD = 0x0; /* Internal Clock */
CCAPM3 = 0x42; /* PWM ON */
CCAP3H = 128; /* Duty cycle value for 50% */
CCAP3L = 128; /* Duty cycle value for 50% */
IPL0 = 0x40; /* Make PCA interrupt the highest priority */
IPH0 = 0x40; /* Make PCA interrupt the highest priority */

CR = 1; /* Start running */
EC = 1; /* PCA interrupt enable */
EA = 1; /* /* Global interrupt enable */
}


Thanks and Regards
Arun

you will find no better source for PCA solutions than the PCA cookbook
http://www.intel.com/design/MCS51/applnots/27085101.PDF

All modern PCAs I have seen match the old Intel PCA, only some have more clocking options.

Erik