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

Something to look out for if you use the "NoStartup" option on the "PROGRAM" line.
 

The TRIS_x RAM locations are not set to $FF (all inputs) if you use "NoStartup".

As a consequence when you use INPUT or OUTPUT to change a pin (or use any command that sets a pin to input or output), it could set other pins to outputs. 

 

As an example:

 

PROGRAM Start NoStartup

Start:

  INPUT RB.0 ' This could set any of the pins RB.1 to RB.7 to outputs

 

So if you use NoStartup you should set the TRIS_x registers like "TRIS_B = %11110000"

 

I just spent a hour finding this problem and I don't want you to have to do the same...

 

Bean.

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