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Individual Instruction Descriptions
4-165
Assembly Language Instructions
4.14.70 SHLS Shift Left Accumulator String to Product
Syntax
[label] name dest
Clock,
clk
Word,
w
With RPT,
clk
Class
SHLS A
n
[~] n
S
+3 1 n
R
+3 3
Execution PH, PL ⇐
src
<< SV
PC ⇐ PC + 1
Flags Affected OF, SF, ZF, CF are set accordingly
Opcode
Instructions 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
SHLS A
n
[~] 1 1 1 0 0 1 1 A
n
1 1 1 1 1 0 A~ 0
Description Shift accumulator string value left n
SV
bits (as specified by the SV register) into
a ((n
S
+ 2) x 16) -bit result. The result is 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. Accumulator content is not
changed. The lower 16-bit value is discarded. SHLS instruction can be used
with RPT instructions, but the string length used will be n
S
+ 2.
See Also SHLS
Example 4.14.70.1 SHLS A0
Shift accumulator string A0 to the left. Accumulator content is not changed. PH contains the upper 16
bits of the shifted result.