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Individual Instruction Descriptions
4-160
4.14.65 SHL Shift Left
Syntax
[label] name dest [, mod]
Clock,
clk
Word,
w
With RPT,
clk
Class
SHL A
n
[~] [,
next A
] 1 1 n
R
+3 3
Execution [premodify AP if
mod
specified]
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
SHL A
n
[~] [,
next A
] 1 1 1 0 0
next A
A
n
1 1 1 1 1 0 A~ 0
Description Premodify the accumulator pointer if specified. Shift accumulator word left n
SV
bits (as specified by the SV register) into a 32-bit result. This 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, PL, is
discarded. The SHL instruction can be used with a RPT instruction, but without
much advantage since the instruction does not write back into the
accumulator. Use SHLAC for this purpose.
See Also SHLS
Example 4.14.65.1 SHL A0, ++A
Preincrement accumulator pointer AP0. Shift accumulator word A0 to the left by SV bits. Accumulator
content is not changed. PH contains the upper 16 bits of the shifted result.