Instant Interrupts Questions

[Josuetas]

Well it seems i got to a dead end, i have most of my work done but now i am out of RAM in my 16f877A, i now HAVE TO migrate to 18f452, so i will have to do it on assembler which i really dont now very well.

I am using portb, timer0 and RX interrupts.

I made it to work the timer int once in this device but i have never used multiple interrupts on it, what has to be done? check flags to see which was the last interrupt? (i dont know ASM), if so, should i manage the interrupt at once or send it to other independent subroutines.

I really am close to cry, all my work and happy moments with this Instant interrupt system seem to come to an end, even more all the work done seems to be useless.

Please help me.

[dhouston]

Can Instant Interrupts be used with the 12F683? If so, what changes are needed in the Include files?

[paul borgmeier]

Josuetas,

Although I have no clue what you are trying to do – you may want to consider the following: The 877A has 256 bytes of EEPROM (w/ 1,000,000 read write cycle life).

You said you were out of RAM? All 368 bytes? I cannot imagine needing immediate access to all of these bytes. Consider reusing some RAM and tuck away the answers in EEPROM and retrieve and replace when needed? See example below.

*** Old Way ***

X var byte
Y var byte
Z var byte

X = 1
Y = 2
Z = 3

If X > 4 then DoSomething1
If Y > 1 then Y = 6
If Z > 6 then DoSomething3

*** New Way ***

Data @1,1,2,3

X Var byte

Read 1,X
If X > then 4 then DoSomething1
Read 2,X
If X > 1 then
Write 2, 6
Endif
Read 3, X
If X > 6 then DoSomething

***

The “New Way” used 1/3 the RAM of the “Old Way”. I think you get the idea. Could this work to save RAM and your past work?

Good Luck,
Paul Borgmeier
Salt Lake City, Utah
USA