Texas Instruments MSP50C6xx manual Mulspl Multiply and Subtract PL From Accumulator

Individual Instruction Descriptions

4.14.43 MULSPL					Multiply and Subtract PL From Accumulator
Syntax
	[label]	name		dest, src [, mod]						Clock, clk				Word, w			With RPT, clk							Class
		MULSPL		An, {adrs}								Table 4–46					Table 4–46							1b
		MULSPL		An[~], An[~] [, next A]							1				1				nR+3					3
Execution			[premodify AP if mod specified]
			PH,PL ⇐		MR * src
			dest ⇐ dest – PL
			PC ⇐ PC + 1
Flags Affected			OF, SF, ZF, CF are set accordingly
			src is {adrs}:					TAG bit is set accordingly
Opcode
Instructions				16	15	14	13	12	11	10	9		8	7	6	5	4		3		2		1		0
MULSPL An, {adrs}				0	1	1	1	1	1	1		An						adrs
				x			dma16 (for direct) or offset16 (long relative) [see section 4.13]
MULSPL An[~], An[~], [next A]				1	1	1	0	0	next A			An		1	1	0	0		0	0		A~			~A
Description			Perform multiplication of multiply register (MR) and value of src. The 16 MSBs
			of the 32-bit product are stored in the product high (PH) register. The 16 LSBs
			of the product (contained in product low (PL) register) are subtracted from
			dest. Certain restrictions apply to the use of this instruction when interrupts are
			occuring in the background. See Section 4.8 for more details.
Syntax					Description
MULSPL {adrs}					Multiply MR by RAM word, substract PL to An
MULSPL An[~], An[~] [, next A]					Multiply MR by An[~] word, substract PL to An[~]
See Also			MULSPLS, MULTPL, MULTPLS, MULAPL, MULAPLS
Example 4.14.43.1			MULSPL A0, *R3++

Multiply MR with the contents of R3, subtract PL from accumulator A0. and store result in accumulator A0 post-increment. Post-increment R3 by 2.

Example 4.14.43.2 MULSPL A2, A2~, ––A

Predecrement accumulator pointer AP2. Multiply MR register to accumulator A2~, subtract PL from accumulator A2, and store result to accumulator A2.

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