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List
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Machine Instructions (Cont)
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( ( S P ) - l ) ( ( S P ) - 2 ) - ( P C ) + 3 . ( P C ) - m
( S P ) 4 S P )
-
2
(
(SP)
-
I )
(
(SP)
-
2)
-
(PC)
7
I.
(PC)
-n
.a.
(SP)
-
(SP)
-
2 whcrc 0 5 n 5 7
(CYZ) = I
>
(CY2)= 0
( Z b - 1
( 2 ) - 0
6 ) - 0
l S ) - I
( P I - I
(P)'O
,
I
1
If condttion truc.
( ( S P ) - l ) ( ( S P ) - Z )
-(PC)-)
(PC)
--
m
,
(SP)
-
ISPI
-
I
U condition f a l s e .
(PC) -(PC)
-
3
Rudr mtn accumohror nll
t l f
the
RSTinrcrzupl
mulr. pendiq
RST
interrupt
roqv;st. M I I
n i i l
&ul dam
31
SID ph.
Mask3
value (bil
concrpodinb
prtlern).
RST intempt with
in mu hi or
Ewbler *rid output w as to
lold
odtput bits into
SOD
latch.
( P C l - ( t S P ) . I ) ( ( S P ) ) . ( S P ) - ( S P ) - I
t C Y l ) = I
(CY2) = 0
If
condition
m i .
( 2 ) = 0
(SP)
-
( 9 )
-
I
( 2 ) * 1
1
RC)
-
(
(SP)
+
1) 1 (SP)
)
.
( S ) s O
( S ) = l
If mndrl~on I&.
( P ) . 1
( P C , - ( P C ) + l
t P ) = O
(A)
-
(Input buffer) (Inpnurrit
with
d
m
no.
n)
(outpat unit with - ( A )
dcricc no. n )
(INTE)
-
I
(INTE)
-
0
(
( 9 )
-
I ) -(A),
(
(SP)
-
2)
-(F)
(SP)
-
(SP)
-
2
( ( S ) - l ) - ( B ) . ( ( S P ) - 2 ) - ( C l
(SP)
-
(SF)
-
2
( ( 9 ) - 1 ) - ( D ) . ( ( S P ) - 2 ) - ( E )
(SP)
-
(SP)
-
2
( ( S P ) - l ) - ( H ) ,
( ( S P ) - ? ) - ( L )
(SP)
-
(SP)
-
2
(F)
-
((SF)
) .
(A)
-
((SP
+ I )
(SP)
-
(SPI
.
1
(C)
-
((SP)
) .
(0)
-
(
(SPI
+
I )
(SP)
-
(SP) 2
( E ) - ( ( S P ) ) . ( D ) - ( ( S T ) - 1 )
(SP)
-
(SP)
+ 2
( L ) - ( ( S P ) ) . ( H ) - ( ( S P ) + L )
(SP)
-
(SP)
*
2
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