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memory

z juisti

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

Parents
  • 0 in reply to z juisti

    Hi dazheng,

    I know you rbusy but i really need some advice from the programmer guru plz.

    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?

    i need to further reduce the power consumption, all unused of hardware peripherals should be disabled. The pullups should be replaced with external resistors, and the internal pullups disabled with a resistor.but what value(?)

    please be generous with your wisdoming voice.

    Thanks,

    zuisti

Reply
  • 0 in reply to z juisti

    Hi dazheng,

    I know you rbusy but i really need some advice from the programmer guru plz.

    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?

    i need to further reduce the power consumption, all unused of hardware peripherals should be disabled. The pullups should be replaced with external resistors, and the internal pullups disabled with a resistor.but what value(?)

    please be generous with your wisdoming voice.

    Thanks,

    zuisti

Children
  • 0 in reply to z juisti

    "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.

  • 0 in reply to z juisti

    internal pullups disabled with a resistor.but what value(?)
    This is an easy question. You need a resistor with the same value as the data sheet specifies for the internal pull-up, but with a negative value. Alas, negative resistances are a bit harder to manufacture, so it may affect your production cost slightly. I haven't seen anyone manufacturing monolithic negative resistors, but with a suitable power source and your loved op-amps, you may even produce your own negative resistors :)