M37212 Mitsubishi, M37212 Datasheet - Page 38

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

(8) Bit 7: Communication mode specification bit
This bit is used for master/slave specification for data communica-
tion. When this bit is “0,” the slave is specified, so that a START
condition and a STOP condition generated by the master are received,
and data communication is performed in synchronization with the
clock generated by the master. When this bit is “1,” the master is
specified and a START condition and a STOP condition are gener-
ated, and also the clocks required for data communication are gen-
erated on the SCL.
The MST bit is cleared to “0” in one of the following conditions.
• Immediately after completion of 1-byte data transmission when
• When a STOP condition is detected.
• When occurence of a START condition is disabled by the START
• At reset
Fig. 8.6.7 I
Fig. 8.6.8 Interrupt Request Signal Generation Timing
38
arbitration lost is detected
condition duplication preventing function (Note).
2
C Status Register
(master/slave specification bit: MST)
I
2
C S t a t u s R e g i s t e r
b 7 b 6 b 5 b 4 b 3 b 2 b 1 b 0
I I C I R Q
S C L
P I N
M37212M4/M8–XXXSP, M37212M6–XXXSP/FP
6 , 7
N o t e : T h e s e b i t s a n d f l a g s c a n b e r e a d o u t , b u t c a n n n o t b e w r i t t e n .
0
1
2
3
4
5
B
I
2
C s t a t u s r e g i s t e r ( S 1 ) [ A d d r e s s 0 0 D 9
L a s t r e c e i v e b i t ( L R B )
( S e e n o t e )
G e n e r a l c a l l d e t e c t i n g f l a g
( A D 0 ) ( S e e n o t e )
S l a v e a d d r e s s c o m p a r i s o n
f l a g ( A A S ) ( S e e n o t e )
A r b i t r a t i o n l o s t d e t e c t i n g f l a g
( A L ) ( S e e n o t e )
I
r e q u e s t b i t ( P I N )
B u s b u s y f l a g ( B B )
C o m m u n i c a t i o n m o d e
s p e c i f i c a t i o n b i t s
2
( T R X , M S T )
C - B U S i n t e r f a c e i n t e r r u p t
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER
N a m e
Note: The START condition duplication prevention function disables the START
0 : L a s t b i t = “ 0 ”
1 : L a s t b i t = “ 1 ”
0 : N o g e n e r a l c a l l d e t e c t e d
1 : G e n e r a l c a l l d e t e c t e d
0 : A d d r e s s m i s m a t c h
1 : A d d r e s s m a t c h
0 : N o t d e t e c t e d
1 : D e t e c t e d
0 : I n t e r r u p t r e q u e s t i s s u e d
1 : N o i n t e r r u p t r e q u e s t i s s u e d
0 : B u s f r e e
1 : B u s b u s y
b 7 b 6
0
0
1
1
condition generation, reset of bit counter reset, and SCL output, when
the following condition is satisfied:
a START condition is set by another master device.
0 : S l a v e r e c i e v e m o d e
1 : S l a v e t r a n s m i t m o d e
0 : M a s t e r r e c i e v e m o d e
1 : M a s t e r t r a n s m i t m o d e
F u n c t i o n s
1 6
with ON-SCREEN DISPLAY CONTROLLER
]
MITSUBISHI MICROCOMPUTERS
( S e e n o t e )
( S e e n o t e )
( S e e n o t e )
( S e e n o t e )
M37212EFSP/FP
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
0
0
0
1
0
0
R —
R —
R —
R —
R W
R W
R W
Rev. 1.0