In SX Microcontrollers, SX/B Compiler and SX-Key Tool, rodneymc wrote:

I wanted do look more at the assembly code for the I/O pins from my post

"Delay, PIN Command, BaudRate Options & SX-Key Listing Feature Request" at [url=http://forums.parallax.com/forums/default.aspx?f=7&m=146347]http://forums.parallax.com/forums/default.aspx?f=7&m=146347[/url]

 

That one got a little complicated, so I wanted to narrow down a couple of questions and try again, since I've had a chance to investigate a little more.

 

1.  Revisiting the PIN command


I did two versions of one program with the only difference in the two files was on pint was defined as:

[code]
MyOut1 PIN RA.1 OUTPUT 
[/code]
 

And then I changed the other file as:

[code]
MyOut1 VAR RA.1 
[/code]
 

I compiled each code and went to the SASM output directory and did a file compare.

 

The only differences was the SX/B code differences, shown above and down further where the output field is accessed, which had

 

MOV W,#252  ; for the PIN RA.1 OUTPUT    %1111_1100

MOV W,#254 ; for the VAR RA.1                %1111_1110


 

So do these SASM constant impactin the TRIS register?  It seems logical as 0 is an output. I guess I was expecting PIN ... Output to give more assembly differences.

 


[quote="Bean"]

[b][/b]
Rodney,
The code to setup the pins is generated by the "PROGRAM" directive.
Bean. 

 

Bean, I didn't quite understand what you were saying there.  Can you give a little more detail?               
   


2.  Revisiting the difference betwen the T and the OT baud modes in the baud rate for SERIN/SEROUT, does the O refer to "Open Collector"? 

 

Thanks!

 

Rodney

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