TMS570LS3137 n2het pwcnt instruction

Gobind,

I would suggest looking at this thread:  http://e2e.ti.com/support/microcontrollers/hercules/f/312/p/287386/1016623.aspx#1016623

for PWM examples. The ECMP instruction works better in most cases than PWCNT.

Anthony,

Thanks for the reply. Since I am a beginner in N2HET, it is very difficult for me to understand the code given in the link you provided. I will explain my requirement and please tell me if there is a simple solution for that. My requirement is like:

The logic which I am trying to implement using PWCNT is:

1. Load the counter parameter of PWCNT with a value to get desired pulse width

2. Give delay to get the desired 0-time

3. Reload the counter parameter of PWCNT with ADCNST instruction

and repeat the process for different pulse widths. For example, my code looks like this:

P00   ADCNST { remote=0x2,min_off=0,data=5}  ;reload the counter with 5

P10   ADCNST { remote=0x3,min_off=0,data=15}  ;loading the counter of DJZ instruction for delay

 L00   PWCNT { next=L02,hr_lr=HIGH,cond_addr=L02,en_pin_action=ON,pin=0,action=PULSEHI,reg=NONE,irq=OFF,data=2,hr_data=1};

 L02   DJZ { next=L00,cond_addr=P00,reg=A};

When i run this code, i see that counter value decrements by 1 each time PWCNT instruction is executed. When this counter reaches zero, there is a wait because the counter of DJZ (=15) is more than PWCNT counter (=5). And when DJZ counter reaches zero, both the counters get reloaded with the values given in ADCNST instruction and the same thing is repeated again. But when i see the waveform, i see only one transition from 0 to 1. This never become zero again. Can you please tell me what is wrong in this logic/code? or is there any other way to implement this?

Thanks.