Intel Microcontroller, 80C196NU manual Table C-4. Effect of SME and FME Bit Combinations, Sme Fme

		REGISTERS
		ACC_STAT
		Table C-4. Effect of SME and FME Bit Combinations
SME	FME	Description
0	0	Sets the OVF and STOVF flags if the sign bits of the accumulator and the addend (the
		number to be added to the contents of the accumulator) are equal, but the sign bit of the
		result is the opposite.
0	1	Shifts the addend (the number to be added to the contents of the accumulator) left by one
		bit before adding it to the accumulator. Sets the OVF and STOVF flags if the sign bits of the
		accumulator and the addend are equal, but the sign bit of the result is the opposite.
1	0	Accumulates a signed integer value up or down to saturation and sets the STSAT flag.
		Positive saturation changes the accumulator value to 7FFFFFFFH; negative saturation
		changes the accumulator value to 80000000H. Accumulation proceeds normally after
		saturation, which means that the accumulator value can increase from a negative saturation
		or decrease from a positive saturation.
1	1	Shifts the addend (the number to be added to the contents of the accumulator) left by one
		bit before adding it to the accumulator. Accumulates a signed integer value up or down to
		saturation and sets the STSAT flag. Positive saturation changes the accumulator value to
		7FFFFFFFH; negative saturation changes the accumulator value to 80000000H. Accumu-
		lation proceeds normally after saturation, which means that the accumulator value can
		increase from a negative saturation or decrease from a positive saturation.

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