Go Down

Topic: How fast does arduino process each line of code? (Read 29903 times) previous topic - next topic


Not really sure exactly how quickly the avr responds to an interrupt.

Pretty fast, the order of events is something like this

int happens (a pin change int takes 4 clock cycle to be recognised)
wait for end of current instruction
push current program counter onto stack
load int vector into PC

IIRC I've seen it take about 1.5uS to get into the ISR.

Thats at the ASM level, however if using C there could be a stack of extra code to save registors as well.

Just as an aside, it can be faster to poll, if you really need to react fast to say a pin change it will be faster to just constantly read the pin. Of course you don't get anything else done  :)


Rob Gray aka the GRAYnomad www.robgray.com

Go Up

Please enter a valid email to subscribe

Confirm your email address

We need to confirm your email address.
To complete the subscription, please click the link in the email we just sent you.

Thank you for subscribing!

via Egeo 16
Torino, 10131