Texas Instruments MSP50C6xx - Manual (Page 256)

Individual Instruction Descriptions
4-170
4.14.74 SHLTPL Shift Left and Transfer PL to Accumulator
Syntax
[label] name dest, src [, mod] Clock, clk Word, w With RPT, clk Class
SHLTPL An, {adrs} Table 4–46 Table 4–46 1b
SHLTPL An[~], An[~] [, next A] 1 1 n
R
+3 3
Execution [premodify AP if mod specified]
PH, PL
⇐
src << SV
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
SHLTPL An, {adrs} 0 1 1 1 0 0 0 An adrs
x dma16 (for direct) or offset16 (long relative) [see section 4.13]
SHLTPL An[~], An[~] [, next A] 1 1 1 0 0 next A An 1 1 0 1 0 0 A~ ~A
Description Premodify the accumulator pointer if specified. Shift accumulator or data memory
value pointed by {adrs} to left n
SV
bits (as specified by the SV register) into a 32-bit
result. The 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
transferred to the destination accumulator (or its offset). This instruction propagates
the shifted bit into PH.
Syntax Description
SHLTPL An, {adrs} Shift data memory word left, transfer PL to An
SHLTPL An[~], An[~] [, next A] Premodify APn if next A specified. Shift An[~] left, transfer PL to An[~]
See Also SHLTPLS, SHLAPL, SHLAPLS, SHLSPL, SHLSPLS
Example 4.14.74.1 SHLTPL A0, *R4++R5
Shift the word pointed by the byte address stored in R4 by n
SV
bits to the left, and store the result in
accumulator A0. Add R5 to R4 and store result in R4 at each execution to get the next memory value.
After execution PH contains the upper 16 bits of the 32-bit shift.
Example 4.14.74.2 SHLTPL A2, *R1++
Shift the value pointed by the byte address stored in R1 by n
SV
bits to the left, and store the result in
accumulator A0. Increment R1 (by 2) at each execution to get the next memory value. After execution
PH contains the upper 16 bits of the 32-bit shift.
Example 4.14.74.3 SHLTPL A1, A1, ++A
Preincrement accumulator pointer AP1. Shift the accumulator A1 by n
SV
bits to the left. After execution
PH contains the upper 16 bits of the 32-bit shift.