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hi im just begining to use the pic18 series
my current setup is:
a melabs USB programmer
PBP 2.45A
Microcode Studio 2.3.0.0
my problem is that when i try to do a really basic thing such as make portb.0 go low it doesent work properly
the following has no effect :
PORTB.0 = 0
however this works for some reson:
low PORTB.4
thanks in advance for any help and responses
O.K. LOW and HIGH function set the i/o of the PIC as output.
When you apply the power to the PIC, the POR(Power on Default) value set the i/o as input. You need to set it by writing to the TRISB register (se datasheet for that). Once the i/o is properly set as output you can write it as you did.
TRISB=0
PORTB.0=0
should work. TRISx is placed at the top of your code. You can Even use the OUTPUT directive wich do almost the same thing.
hth
exelent that worked, iv only used the pic16s up until now and was not used to needing Tris, although I was familiar with it.
I appreciate the quick response mister_e
Well TRISx is needed in all PIC family when you Write directly to the PORT register. You don't need the TRISx setting if you use PBP statement, HSEROUT,SERIN... HIGH, LOW...