Hi dazheng,
Need to know ... what is EEPROM used in MCU for ?. I know EEPROM stand for Electrical Erasable Programming ROM but I need to know what's the purpose or where it going to be used in MCU?
I ask this because some of MCU dont have EEPROM ( EEPROM = 0 byte) ie 80NC535 & 80NC321 and the best thing about this MCU (without EEPROM) that's its cheaper than MCU with EEPROM. If it just minor used and can solve it in other method (and not effect my project) , I will use it as I need to lower the cost as much as possible.
Any instruction (ie in proton) that must be used on MCU with EEPROM ?
More explanation greatly appreciated.
Thanks
zuisti
"what is 'port change interrupt' (ports 4,5,6,7) means ... is it port change from low to high or high to low analog signal(?) or a changes of digital signal ie from 5V to 4.7V or 4.26V?"
Such silly questions.
Such a waste of a guru's time.
"what is 'port change interrupt' (ports 4,5,6,7) means ... "
Good grief. Just look it up. No wonder our project sucks so bad. You're just mucking about blindly without reading a thing.
GET WITH THE PROGRAM!
"is it port change from low to high or high to low analog signal(?) or a changes of digital signal ie from 5V to 4.7V or 4.26V?"
Yes.