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

I have a question about a code snippet from the ADC example in Guenther's book mentioned above.

mov w,	>>rc			;read current state of adc's
not w					;turn inputs to outputs
and w, #%01010000          ;mask adc1 and adc0
or port_buff, w 	               ;save new value in buffer
mov rc, port_buff              ;refresh charge/discharge lines

I understand what the mov commands are doing and how the logical operations affect various bytes/registers, but I can't figure out why it is done this way. Perhaps I am overlooking something extremely basic, but I am still learning, so it's escaping me. Could someone go into some detail on the code above?

The input and output bits are staggered so that when the mov w, >>rc line occurs it shifts the input bits into the location where the output bits were located. Then the next command flips everthing....?

I indented the code/comments but when I posted it removed the formatting. sorry.

Thanks in advance,
Devin

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