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Hitachi MP-1802 Technical Manual page 45

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4 t -
( T h e c h i p s w i t c h
C S 6 1 1 c h i p s a r e a t t h e t e r m i n a l s
1 - 2 w h e n
s h i p p e d . )
I C 6 1 3 @ p i n
b e c o m e s t f L f r l e v e l
i f
$ f f ' O t
$ f f ' O f i s a d d r e s s e d
a t R / W O U T . E = r r H t f .
( 5 m
a n d T m
a r e o u t p u t r e s p e c t i v e l y
a t
t h e D 7 a n d D 0 d a , t a l i n e s . )
I C 6 1 3 @ p i n
b e c o m e s t r l f f l e v e l
i f
$ f ' f O z *
$ f p O Z i s
a d d r e s s e d .
a t R / W O U T . Q = r f H r t o
( n t
t h i s
t i m e ,
m o d e s e l e c t o r
I C 6 1 5
l - a t c h e s t h e d a t a a t Q t s r j - s i n g p u l s e e d g e . )
I C 6 1 2 @ p i n
b e c o m e s f r L f r l - e v e l i f
$ f ' f ' O O
$ F F O 3 i s a d d r e s s e d
a t R / W O U T . E = f t H r r ,
( A t t h i s
t i m e ,
I C 6 1 8 F D C b e c o m e s W r i t e
E n a b l e .
I C 6 1 2 @ p i n
b e c o m e s f f L f ' w h e n R / W O U T . E = f r H r t a n d $ r ' f o o
$ F F 0 3 i s
a d d r e s s e d .
( a t
t h i s
t i m e ,
I C 6 1 8 F D C b e c o r n e s R e a d
E n a b l e s t a t u s . )
I C 6 1 3 @ p i n
b e c o m e s f f H t r i f
t h e
t h r e e
a d . d r e s s e s a r e
d e s i g n a t e d
at vMA . EXPROM
-XTrr
. R/W = ll Hfr , ( $n8oo
$r'nFr' ( noor ROM
a d . d r e s s ) , $ r ' p o o
$ r ' r ' o ; ( r ' o c a d d r e s s ) a n d $ r F o 4
$ r ' r ' o Z
( U O n S E L a d . d r e s s ) ) .
( f i r : - s o u t p u t
i s
u s e d a s t h e R O M K I L L
s i g n a l . )
I C 6 2 / + @
p i n
b e c o n e s
r r l r r i f
I C 6 1 3 @ p i n
i s
r t H r r a n d E = r r H t t o
( A t t h i s
t i m e ,
t h e t h r e e
s t a t e
I / 0 b u f f e r
I C 6 2 2 i s
i n t h e
E n a b l e s t a t e
a n d t h e d a t a f l o w s
t h u s ,
r - - + I
M p - 1 8 0 2 I
h
L e v e r - 3 w h e n E n r - T T T = { " L " I .
L -
J
I r r g r r J
a
. . , / / n 3

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Mp-3550