SX Microcontroller Bit Math Method

Copy unaligned bits from one register to another:

With possibility of "jitter" on destination pin

	setb	RA.4
	sb	C
	clrb	RA.4

ie: Assume the bit is one, then change to 0 if it is not.

Saves 1 instruction over the more standard:

With possibility of error due to change in value on source pin

	snb	C	; load the data
	setb	RA.4
	sb	C
	clrb	RA.4

This macro...

COPY_BIT MACRO   varA_bit,varB_bit
        NOEXPAND
        snb	varA_bit
        setb	varB_bit
        sb	varA_bit
        clrb	varB_bit
        ENDM

...will produce the same output if called like this:

COPY_BIT 3.0,5.4

but can be used on any current bank registers.

Note that according to SASM 1.4 manual macro arguments can not be reserved symbols, e.g. RA, RB, etc.

See also:

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