Texas Instruments MSP50C614 manual Shlspls Shift Left String With Subtract PL, Shlspls An~, An~

Individual Instruction Descriptions

4.14.72 SHLSPLS						Shift Left String With Subtract PL
Syntax
	[label]	name			dest, src								Clock, clk				Word, w			With RPT, clk					Class
		SHLSPLS			An, {adrs}										Table 4±46					Table 4±46						1b
		SHLSPLS			An[~], An[~]									nS+3				1				nR+3				3
Execution			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
SHLSPLS An, {adrs}				0		1		1	1	0		1	1		An						adrs
					x				dma16 (for direct) or offset16 (long relative) [see section 4.13]
SHLSPLS An[~], An[~]				1		1		1	0	0		1	1		An		1	1	1	0		0	0	A~			~A
Description			Shift accumulator string or data memory string pointed by {adrs} to left nSV bits
			(as specified by the SV register). 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 PH register. The lower 16 bits of the result PL are subtracted from the
			destination accumulator (or its offset). This instruction propagates the shifted
			bit to the next accumulator.
Syntax						Description
SHLSPLS An, {adrs}						Shift RAM string left, subtract PL from An
SHLSPLS An[~], An[~]						Shift An[~] string left, subtract PL from An[~]
See Also			SHLSPL , SHLTPL , SHLTPLS, SHLAPL, SHLAPLS

Example 4.14.72.1 SHLSPLS A0, *R4++R5

Shift the string pointed by the byte address stored in R4 by nSV bits to the left, subtract the shifted value (PL) from the value in the accumulator string in A0, and store the result in accumulator string A0. Add R5 to R4 and store result in R4. After execution of the instruction, PH is copied to the next to the last accumulator of the string.

Example 4.14.72.2 SHLSPLS A2, *R1++

Shift the string pointed by the byte address stored in R1 by nSV bits to the left, subtract the shifted value (PL) from the value in the accumulator string in A2, and store the result in accumulator string A2. Increment R1 (by 2). After execution of the instruction, PH is copied to the next to the last accumulator of the string.

Example 4.14.72.3 SHLSPLS A1, A1

Shift the accumulator string A1 by nSV bits to the left, subtract the lower 16-bits of shifted value (PL) from A1, and store the result in A1. After execution PH contains the upper 16 bits of the 32 bit shift.

Assembly Language Instructions 4-167