1989_MELPS_7700_Software_Manual

ROL Rotate One Bit Left ROL
Operation
If m=O,
If m=1,
Description
The carry flag C is linked to the accumulator or memory, and the combined
contents are rotated by 1 bit to the left.
Bit 0 of the accumulator or memory is loaded with the content of the carry flag
C before execution of this instruction, and the carry flag C is loaded with the
content of bit 15 (or bit 7 if the data length selection flag m is set to 1) of the
accumulator or memory before execution of this instruction.
Status flags
IPL :
N
V
m
x
o
I
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.
Z Set to 1 when the result of operation is O. Otherwise, cleared to O.
C
Set to 1 when bit 15 (or bit 7 if the data length selection flag m is set to 1) before
execution of the instruction is 1. Otherwise, cleared to 0
Addressing mode Syntax Machine code Bytes Cycles
AccufTIulator ROL A 2A16 1 2
Direct ROL dd 2616, dd 2 7
Direct indexed X ROL dd, X 3616, dd 2 7
Absolute ROL mmll 2E16, II, mm 3 7
Absolute indexed x ROL mmll, X 3E16, II, mm 3 8
(Note1) The accumulator addressing mode's specification in this table applies when using the accumulator
A. If using the accumulator 8, replace "A" with "8". 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.
128