ws28 timing with asm

Hallo together,

I am currently trying to write a assambly routine to signal ws2812b leds.
Im for now just trying to get one led white.
unfortunatly i dont have an osziloscope to check whats going on.
Im not even 100% sure if ive got the ticks needed calculated correctly.

is it correct that 0.9us at 20mhz = 18ticks? and 0.35us = 7ticks? , 50us = 1000ticks

thanks
joel

At 20MHz, one clock cycle is 50ns or 0.05us.