M37212 Mitsubishi, M37212 Datasheet - Page 111

• Manufacturer Part Number: M37212
• Description: SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER
• Manufacturer: Mitsubishi

Rev. 1.0
C R T C l o c k S e l e c t i o n R e g i s t e r
b 7 b 6 b 5 b 4 b 3 b 2 b 1 b 0
0
A - D M o d e R e g i s t e r
0
b 7 b 6 b 5 b 4 b 3 b 2 b 1 b 0
0
0
0
N o t e : I t i s n e c e s s a r y t o c o n n e c t o t h e r c e r a m i c r e s o n a t o r o r q u a r t z - c r y s t a l o s c i l l a t o r a c r o s s t h e p i n s X
0
2 t o 7
0 , 1 C R T c l o c k
B
C R T c l o c k s e l e c t i o n r e g i s t e r ( C K ) [ A d d r e s s 0 0 E D
M37212M4/M8–XXXSP, M37212M6–XXXSP/FP
s e l e c t i o n b i t s
( C K 0 , C K 1 )
F i x t h e s e b i t s t o “ 0 . ”
B
t o
3
4
t o
0
2
5
7
A - D m o d e r e g i s t e r ( A D M ) [ A d d r e s s 0 0 E E
N a m e
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER
A n a l o g i n p u t p i n s e l e c t i o n
b i t s
( A D M 0 t o A D M 2 )
T h i s b i t i s a w r i t e d i s a b l e b i t .
W h e n t h i s b i t i s r e a d o u t , t h e v a l u e i s “ 0 . ”
S t o r a g e b i t o f c o m p a r i s o n
r e s u l t ( A D M 4 )
N o t h i n g i s a s s i g n e d . T h i s b i t s a r e w r i t e d i s a b l e b i t s .
W h e n t h e s e b i t s a r e r e a d o u t , t h e v a l u e s a r e “ 0 . ”
b 1
1
0
0
1
N a m e
b 0
0
1
1
0
S i n c e t h e m a i n c l o c k i s u s e d a s t h e
c l o c k f o r d i s p l a y , t h e o s c i l l a t i o n
f r e q u e n c y i s l i m i t e d . B e c a u s e o f t h i s ,
t h e c h a r a c t e r s i z e i n w i d t h ( h o r i z o n t a l )
d i r e c t i o n i s a l s o l i m i t e d . I n t h i s c a s e ,
p i n s O S C 1 a n d O S C 2 a r e a l s o u s e d
a s i n p u t p o r t s P 3
T h e c l o c k f o r d i s p l a y i s s u p p l i e d b y c o n n e c t i n g R C
o r L C a c r o s s t h e p i n s O S C 1 a n d O S C 2 .
T h e c l o c k f o r O S D i s s u p p l i e d b y c o n n e c t i n g t h e
f o l l o w i n g a c r o s s t h e p i n s O S C 1 a n d O S C 2 .
• a c e r a m i c r e s o n a t o r o n l y f o r O S D a n d a f e e d b a c k
• a q u a r t z - c r y s t a l o s c i l l a t o r o n l y f o r O S D a n d a
r e s i s t o r
f e e d b a c k r e s i s t o r ( S e e n o t e)
b 2 b 1 b 0
0 : I n p u t v o l t a g e < r e f e r e n c e v o l t a g e
1 : I n p u t v o l t a g e > r e f e r e n c e v o l t a g e
0
0
0
0
1
1
1
1
6
a n d P 3
0
0
1
1
0
0
1
1
F u n c t i o n s
F u n c t i o n s
0 : A - D 1
1 : A - D 2
0 : A - D 3
1 : A - D 4
0 : A - D 5
1 : A - D 6
0 : A - D 7
1 : A - D 8
1 6
7
]
F u n c t i o n s
r e s p e c t i v e l y .
1 6
with ON-SCREEN DISPLAY CONTROLLER
]
MITSUBISHI MICROCOMPUTERS
O S D o s c i l l a t i o n
f r e q u e n c y
= f ( X
O S D o s c i l l a t i o n
f r e q u e n c y
= f ( X
I N
I N
M37212EFSP/FP
)
) / 1 . 5
A f t e r r e s e t R W
I n d e t e r m i n a t e
Addresses 00EE
0
0
0
Address 00ED
A f t e r r e s e t R W
I N
a n d X
0
0
R W
R —
R
R —
—
O U T
R W
R W
.
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