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18F1320 PortB direct addressing

 
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GegFord



Joined: 16 Dec 2019
Posts: 5

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18F1320 PortB direct addressing
PostPosted: Mon Dec 16, 2019 7:43 am     Reply with quote

In the past I successfully completed numerous projects using the 16F876. I declared Port B like this:

#Byte PortB = 0x06

That was fine, never had any problems.

I'm now working with an 18F1320. The address given for Port B is 0xF81, and indeed the Watch window give the PortB address as 0XF81 but how do I address is directly as before?

I tried:
#Long PortB = 0x0F81

But that didn't work. I found a way around what I wanted to do without addressing the port directly but I would love to know, just out of interest how to do it. It may be that is can't be done at all - that too would be a valid reply to the question.

Any insights gladly received.
Ttelmah



Joined: 11 Mar 2010
Posts: 19541

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PostPosted: Mon Dec 16, 2019 7:47 am     Reply with quote

Are you reading or writing?.

On the PIC18, things change. You need to write to the LAT (not to the port),
but read from the port.

Best way is to use the compiler defines:
Code:

#byte LATB=getenv("SFR:LATB")
#byte PORTB=getenv("SFR:PORTB")


Then to read things from the port, read 'PORTB', but to write values to
the port, write to LATB.
GegFord



Joined: 16 Dec 2019
Posts: 5

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PostPosted: Tue Dec 17, 2019 5:32 am     Reply with quote

Wow! That's fantastic. I'll give it a try, Thanks ever so much.
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