PIC16F84A EEPROM problems

[The Master]

Hi, ive been searching google for about 3 hours now but still not found the answer.

My code needs to read/write a single byte on EEPROM. When i use the read command i get a weird value returned (usually 127, i have no idea where that comes from) and when i use write the chip resets ifself.

I'm new to using EEPROM but it looked simple till i tried to use it

Heres a cut down sample of my program

taddress var byte
taddress=20
write 0,taddress

[skimask]

Heres a cut down sample of my program

taddress var byte
taddress=20
write 0,taddress

That code snip really doesn't tell us anything. Post the whole thing. You've got a DEFINE wrong somewhere, maybe some conflicting interrupts, who knows...
Maybe change the handle from 'The Master' to 'Maybe the Master in the Future, but for now, I can't get a simple EEPROM write to work'...

[fazan83]

That code snip really doesn't tell us anything. Post the whole thing. You've got a DEFINE wrong somewhere, maybe some conflicting interrupts, who knows...
Maybe change the handle from 'The Master' to 'Maybe the Master in the Future, but for now, I can't get a simple EEPROM write to work'...

Maybe he is master in other field.

[The Master]

Maybe he is master in other field.

too right :P thats my name on other forums. just keeping it the same. im good at VB6 etc

ive not defined anything so far and ive not got any interrupts. the example i saw on the net didnt say to define anything

http://www.microengineeringlabs.com/...les/pbc/ee.bas

everything else in the program works fine. all the serin/serout if then elses etc. its just read/write that dont work

[The Master]

righty. now im at home i can give you th full code. i made an new test program and it still doesnt work

trisa=%00000000
trisb=%00000000

t1 var byte

high portb.0
pause 100
low portb.0
pause 100


high portb.3
pause 100
low portb.3
pause 100

read 0,t1

portb=t1

end

it has 8 LEDs connected to portb. 2 of them flash on startup to prove the chip is working then it should read a value from EEPROM[0] and display it using the LEDs.

i set the EEPROM values in the programmer software before programming. if i read everything back from the chip then i can see it definately has set the EEPROM.

no matter what value i put in the EEPROM the LEDs always tell me the value is %11111110

[skimask]

Instead of END, try STOP, or a read/portb/goto loop, see what happens.
Do you have anything across Vss & Vdd?