Texas Instruments MSP50C6xx manual Shlapl Shift Left with Accumulate, Shlapl A2, *R1++, Ph, Pl

Individual Instruction Descriptions

4.14.69 SHLAPL				Shift Left with Accumulate
Syntax
	[label]	name		dest, src [, mod]							Clock, clk			Word, w			With RPT, clk					Class
		SHLAPL		An, {adrs}								Table 4–46					Table 4–46						1b
		SHLAPL		An[~], An[~] [, next A]								1			1				nR+3				3
Execution		[premodify AP if mod specified]
		PH, PL ⇐				src << SV
		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
SHLAPL An, {adrs}			0		1		1	1	1	0	0	An						adrs
				x				dma16 (for direct) or offset16 (long relative) [see section 4.13]
SHLAPL An[~], An[~] [, next A]			1		1		1	0	0	next A		An		1	1	1	0		1	0	A~			~A

Description Premodify the accumulator pointer if specified. Shift accumulator word or data memory word pointed by {adrs} to left nSV bits (as specified by the SV register) into a 32-bit result. This result is zero-filled on the right and either zero-filled or sign-extended on the left (based on the setting of the extended sign mode (XM) bit in the status register). The upper 16 bits are latched into the product high (PH) register. The lower 16 bits of the result [product low (PL) register] is added to the destination accumulator (or its offset). This instruction propagates the shifted bits to the next accumulator.

Syntax		Description
SHLAPL An, {adrs}		Shift data memory word left, add PL to An
SHLAPL An[~], An[~] [, next A]		Shift An[~] left, add PL to An[~]
See Also	SHLAPLS, SHLTPL , SHLTPLS, SHLSPL, SHLSPLS

Example 4.14.69.1 SHLAPL A0, *R4++R5

Shift the word pointed by the byte address stored in R4 by nSV bits to the left, add the shifted value (PL) with accumulator A0, store the result in accumulator A0. Add R5 to R4 and store result in R4. PH holds the upper 16 bits of the shift.

Example 4.14.69.2 SHLAPL A2, *R1++

Shift the word pointed by the byte address stored in R1 by nSV bits to the left, add the shifted value (PL) with the accumulator (A2), and store the result in accumulator A2. Increment R1 (by 2) . PH holds the upper 16 bits of the shift.

Example 4.14.69.3 SHLAPL A1, A1, ++A

Preincrement accumulator pointer AP1. Shift the accumulator A1 by nSV bits to the left, add the shifted value (PL) to the accumulator and store the result in accumulator (A1). After execution PH contains the upper 16 bits of the 32-bit shift.

Assembly Language Instructions 4-165