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and more
about Sharp
PC-1500
at
http://www.PC-1500.info
2-4.
LH5801 instructions
2-4-1.
Outline
·24
'f
his
section
deals
\V
ith
function
of
each
instruction.
AOC
l
Instruction
name
(
Funclional
descriplion
)
•Format
AOC RL
T
Operand
•Operation
A
+
[operand]
L
Symbol
(EX)
(
Example
)
+
C
-
-
>
A
L
symboiL
Symbol
Symbols used in discussing operand,
function,
and operation
A
:
Contents
of
the
accumulator
(8
bits)
X
L.:
Contents
of
the
low
order
8
bi ts
of
X reg
\'
I.:
(.'ontcnts
of tht.:
)()\\'
ordr.:r
8
t>its
of
\'
reg
U
I.:
C.:<Hl
lt:nts
of
the:
]<,,,.
ordc:r
X bits
oi
lJn:g
(RI.
re1>resents
eit
her
of
XI..
YI..
or
Ul..)
XH:
Contents
or the
high
order
8
bits
of Xrcg
YH
:
Comcms
of
the high
order
8
bits
of Yrcg
U
H
:
Contents
or
the high
order
8
bits
of Urcg
(R
M
rqirescms
either
of
XH.
\'
II.
o
r
Ull.)
Xreg:
Co111en1~
of
lhr
X
rcgisia (
1
6 bi•~)
\"reg:
c·o
nte
nt
~
of
the
y·
register
(
1
6
hits)
Urcg:
C
ontcnts
of
the
lJ
register
{
I(>
bits)
( Rn:g
represents either
of
Xreg.
Yr~g.
or Ureg.)
P:
Contcms
of
t
he
program
cou n1
cr
( 16
bil
s)
PL:
<..«>nll'nts
of
IO\\'
order
8
bil~
of
lhc
prograrn
counter
Pf-I
:
(~oruerHs
of high
order
8 hits
()f
the
progran1 counlcr
S:
(
'
· on1c11ts o
f
t
he
stack
poinlc.:r
(
16
hi
ts)
SI.:
Contents
(
l
f
lo\v
order
~
bits
of
the
stuck
poin1cr
Sii:
Contents of
high
order
8
bi
ts
of
t
he
stack
pointer
(Rrcg):
Contents
of t he
rncmOr\'
rcpr,·scntcd
by
Rreg
(accessed
wit
h
M
lO)
r!(R
rq~):
Contents
of t
he
memory
rcpr
cscn1
cd
bl'
Rrcg (accessed
wit
h
M [
I
)
(r1'>):
Contents
oft
he
mcmor)'
represented
by
16
bits
of
ab
(accessed
by
MEO):
'"
here
a
rep
rl~sents
high
<>rdcr
8
bits
f>f
the:
address and
I>
IO\\.
ordl"r
8
bit~
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