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Everytime I start a project that requires a battery I spend way to much time getting the PIC to even run. The other components are powered up fine.
I would like to run my PIC16F876A at 3.0 or 3.3V. I would like to run the PIC at 4mhz. Will the PIC handle datarates of 9600 Baud on the UART pins?
I have my PIC in the circuit and have an LEd tied to PORTC.0 to make sure the PIC is running. IT does not Illuminate the LED. What should I be looking for?
Any help would be greatly appreciated,
Yes it will. Look the datasheet or use my SPBRG calc. with the right settings, you can have a 0.16% error wich is really not as this bad.Quote:
Originally Posted by Scott
Once again, i'll bet on the Brown-out detect fuse. Disable it and post your results.Quote:
I have my PIC in the circuit and have an LEd tied to PORTC.0 to make sure the PIC is running. IT does not Illuminate the LED. What should I be looking for?
Thanks Mister_E!
We have the PIC running! Brown out was the problem.
Now the data going over the UART is not correct. Here is some test code I am using:
' Setup Auto Epic Settings
@ device pic16F876A, hs_osc, wdt_off, pwrt_on, protect_off
DEFINE OSC 4 ' Set Xtal Frequency
' Setup Hardware for uart
DEFINE HSER_BAUD 9600
DEFINE HSER_RCSTA 90h
DEFINE HSER_TXSTA 24h
DEFINE HSER_SPBRG 129
DEFINE HSER_CLROERR 1
pause 100
HSEROUT ["Startup", 13, 10]
main:
pause 5000
hserout ["Data Out.....", 13,10]
goto main
Thanks again,
You didn't choose the right SPBRG value for your crystal... @ 4MHZ you should have...
Code:DEFINE HSER_RCSTA 90h
DEFINE HSER_TXSTA 24h
DEFINE HSER_SPBRG 25 ' 9600 Bauds
It seems I need to go back and review the Microchip data sheets!
Thanks for all the help everything is working fine!
It seems I need to go back and review the Microchip data sheets!
Thanks for all the help everything is working fine!