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

Gents,

I am trying to use a variable to help me set select bits within another variable.  The bits set will vary, and thus the desire to use a variable.  What I think should work does not.  So, I know I must not be understanding something.  Can someone help me on this?

Here is an example code to illustrate how I am trying to manipulate bits in TestByte by using the variable BitLocation as a bit positioner.  The counter will go from 7 to 0, so that all bits will be set for this example.

I am using the SXSim to monitor the process.  The BitLocation does get smaller, but the use of it in the SETB command is not reflected.

[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,#$07		   ;location of bit to be set in TestByte
mov TestByte,#$00		      ;Initial value = 0

Main
    SETB TestByte.BitLocation
    DEC BitLocation
JMP Main
[/code]

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