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

I'm trying to understand and access BANK 0 on and SX48.  This is how I understand it to work, please correct me if I'm wrong.

 

The top 4 bits of FSR are used to select a bank, and the bottom 4 bits of FR with the 5 bit being set will give access to BANK 0. 

 

According to the documentation, I should no longer have access the global registers.  This seems to be accurate in terms of registers 0A - 0F, however, I'm still able to access the ports RA - RE.   Is this correct?  Or have I done something wrong?  

 

This is the code I'm using.

 

; Setup bank 0

clr fsr

; mov a value into the first file register

mov $10, #$ff

; Move a value in to port E

mov RE, #$FF

 

 

In the debugger I can see the value being moved into port E.  The debugger however does not show BANK 0;  Is this by design?  Difficult to tell if I'm accessing it, however when I read the values back, I can see them pass through W.

 

Thanks for any help

 

Richard Carmel

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