TLC5940 question

[tubos]

I've read through the datasheet of the 5940 and i think i have a better understanding
of how it works.

I have a question before i start to bitbang it.

Can i continously run a clock to GSCLK pin and toggle the BLANK pin after 4096 clocks
from within an ISR , while updating Greyscale data asynchronous in a main function to update the the channels with new PWM data?

 

[Gobbledok]

Sure can.

I use an actual PWM output for the 4096 clocks and count them with a counter input. Then an ISR fires after counting 4096 clocks from the PWM output.

 

[tubos]

Can i update the GS registers while in the middle of a GSclock signal between 0 and 4096 ?

Are there any drawbacks for doing this?

 

[Gobbledok]

Yes that is fine. No drawbacks. The chip is designed for this purpose.

The GreyScale data is not actually latched in to the internal registers until the XLAT (latch) pulse.