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

Jon is correct. The bit position must be a constant when using the SETB instruction.
 

Here is how I would do it

 



[code]
DEVICE SX28, TURBO, STACKX, OSC4MHZ
IRC_CAL IRC_4MHZ
FREQ 4_000_000


RESET   Start

;************************ Program Variables *****************************

org     $08                          ;First register address in main memory
                                     ;bank
TestByte        ds      1            ;Temporary storage
BitLocation     ds      1            ;Bit location within TestByte


org $100
Start
break

mov BitLocation,#$80           ;location of bit to be set in TestByte
mov TestByte,#$00              ;Initial value = 0
 

clc                            ;clear carry so we shift a zero on the first shift 

  

Main
 

  or TestByte,BitLocation      ; Set the bit 

  rr BitLocation               ; Adjust so next bit is a "1" 

jnc Main                       ; Quit when the "1" bit gets shifted out to the carry bit 

  

jmp $                          ; Stop here 
[/code]

 

Bean

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