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Individual Instruction Descriptions
4-161
Assembly Language Instructions
4.14.66 SHLAC Shift Left Accumulator
Syntax
[label] name dest, src
[,
mod
] Clock,
clk
Word,
w
With RPT,
clk
Class
SHLAC A
n
[~], A
n
[~] [,
next A
] 1 1 n
R
+3 3
Execution [premodify AP if
mod
specified]
dest
⇐
src
<< 1
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
SHLAC A
n
[~], A
n
[~] [,
next A
] 1 1 1 0 0
next A
A
n
0 0 1 1 0 0 A~ ~A
Description Premodify accumulator pointer if specified. Shift source accumulator
src
(or
its offset) left by one bit and store the result in the destination accumulator (or
its offset). LSB of result is set to zero.
Example 4.14.66.1 SHLAC A1, A1
Shift accumulator A1 by one bit to the left.
Example 4.14.66.2 SHLAC A1~, A1, ––A
Predecrement accumulator pointer AP1 by 1. Shift the newly pointed accumulator A1 by one bit to the
left, store the result in accumulator A1~.