1989_MELPS_7700_Software_Manual

ASL
Arithmetic ShiH LeH
ASL
Operation
When m=O
b15
bo
When m=1
b7
bo
Description
Shifts all bits of the accumulator or memory one place to the left. Bit 0 is loaded
with o. The carry flag C is loaded from bit 15 (or bit 7 when the data length
selection flag m is set to 1) of the data before the shift.
Status flags
IPL:
N
v
m
x
D
I
Z
C
Not affected.
Set to 1 when bit 15 (or bit 7 if the data length selection flag m is set to 1) of
the operation result is 1. Otherwise, cleared to O.
Not affected.
Not affected.
Not affected.
Not affected.
Not affected.
Set to 1 when the result of operation is O. Otherwise, cleared to O.
Set to 1 when bit 15 (or bit 7 when the data length selection flag m is set t01)
before the operation is 1. Otherwise, cleared to O.
Addressing mode Syntax
I Machine code I Bytes Cycles
Accumulator ASL A OA16 1 2
Direct ASL dd 0616, dd 2 7
Direct indexed X ASL dd, X 1616, dd 2 7
Absolute ASL mmll OE16, II, mm 3 7
Absolute indexed X ASL mmll, X 1E16, II, mm 3 8
(Note1) The accumulator addressing mode's specification in this table applies when using the accumulator
A. If using the accumulator B, replace "A" with "B". In this case, "4216" is added at the beginning
of the machine code, the bytes-count increases by 1 and the cycles-count increases by 2.
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