I dunno where you can look it up, probably a modern car manual, but as someone within an entire family of mechanics, ive never heard of a blinking check engine light that didn't mean your shit is seriously fucked up and any second away from blowing apart. In fact blinking check engine lights are pretty new overall to differentiate between shit like 'this light is on because your o2 sensor is going bad' and 'this light is on because only half your motor is getting enough oil', now it blinks with the oil problem so you know it is serious. Although a number of cars these days have completely separate 'service engine' and 'engine warning' lights so a blinking check engine light might not exist for whatever model.

If anything other than your blinker blinks more than a handful of times past startup, something is very very wrong.

just open your owner manual, for most cars is standard

steady light: maintenance

flashing for a time: issues on the emissions controls, you risk on the long run to damage the converter or stuff like that

fixed flashing light: something seriously wrong, like a misfire or worse, running the engine is actively damaging it. car runs in protected mode as not to leave you stranded in a dangerous situation, but you are not supposed to run it.

what's your car if I might ask?