PWM and MEMORY

[HenrikOlsson]

No need to change microcontroller. The 12F683 has 256 bytes of EEPROM in which you can store whatever you want. Use the WRITE and READ commands to store and retrieve your values.
How to implement it depends on how often the value changes. The EEPROM has an finite number of write cycles so if the value changed several times per second it's not a good idea to constantly write it to the EEPROM, in that case you need som power fail signal which triggers a write. If the value doesn't change very often a simple timer which triggers a write after 5 seconds (or whatever) of unchanged value should be good enough.

/Henrik.

[HenrikOlsson]

You could use the EEPROM area, but the regular memory area is flash, and so it will also preserve the value for years when the power is off.

The 12F series can't write to its own FLASH memory so you have to use the EEPROM if you want the value to be changeable AND persistent.

/Henrik.

[pescador]

The 12F series can't write to its own FLASH memory so you have to use the EEPROM if you want the value to be changeable AND persistent


uh oh - what? - I cant use a 12f683?

[pescador]

The rate changes with the push of a button - duty cycle decrements from 128 to 10 and start back to 128. I found 128 is the brightest my leds will go. The user can hold the button in and it auto counts down, goes dim, then goes back to 128. I dont know how but the PWM command resets itself to 128 - the original value - without me having to maker it 128. If that makes sense. I'll post my simple code in next post.

[pedja089]

No need to change microcontroller. The 12F683 has 256 bytes of EEPROM in which you can store whatever you want. Use the WRITE and READ commands to store and retrieve your values./Henrik.

Com on, you won't read what is written here, won't read datasheet. And you are willing to throw little money someone, just to write you what is already said few times..

[pescador]

Com on, you won't read what is written here, won't read datasheet. And you are willing to throw little money someone, just to write you what is already said few times..

I was in a rush this morning - I'm getting it.. I admit I panicked.. I do read - I work 80- hours a week - 40 hours at a real good job and 40 my own business... I try to save time sometimes...