M38867E8AHP MITSUBISHI [Mitsubishi Electric Semiconductor], M38867E8AHP Datasheet - Page 30

• Manufacturer Part Number: M38867E8AHP
• Description: SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER??
• Manufacturer: MITSUBISHI [Mitsubishi Electric Semiconductor]

Serial I/O2
The serial I/O2 function can be used only for clock synchronous
serial I/O.
For clock synchronous serial I/O the transmitter and the receiver
must use the same clock. If the internal clock is used, transfer is
started by a write signal to the serial I/O2 register.
[Serial I/O2 Control Register (SIO2CON)]
001D
The serial I/O2 control register contains seven bits which control
various serial I/O functions.
Fig. 27 Block diagram of serial I/O2 function
30
16
P 7
P 7
P 7
P 7
1
0
N o t e :
/ S
/ S
3
2
/ S
/ I N T
/ S
O U T 2
I N 2
X
R D Y 2
C L K 2
X
C I N
2 1
T h e s e a r e a s s i g n e d t o b i t s 7 a n d 6 o f t h e C P U m o d e r e g i s t e r ( a d d r e s s 0 0 3 B
T h e s e b i t s s e l e c t a n y o f t h e h i g h - s p e e d m o d e , t h e m i d d l e - s p e e d m o d e , a n d t h e l o w - s p e e d m o d e .
I N
M a i n c l o c k d i v i d e r a t i o
s e l e c t i o n b i t s ( N o t e )
S e r i a l I / O 2 p o r t s e l e c t i o n b i t
S e r i a l I / O 2 p o r t s e l e c t i o n b i t
S
R D Y 2
P 7
“ 1 ”
“ 0 ”
“ 0 ”
P 7
“ 1 ”
P 7
o u t p u t e n a b l e b i t
“ 1 ”
“ 0 ”
2
1
l a t c h
3
l a t c h
l a t c h
“ 0 0 ”
“ 0 1 ”
“ 1 0 ”
S
R D Y 2
S e r i a l I / O 2 s y n c h r o n o u s
S y n c h r o n i z a t i o n
c i r c u i t
c l o c k s e l e c t i o n b i t
E x t e r n a l c l o c k
“ 1 ”
1 6
) .
“ 0 ”
S e r i a l I / O c o u n t e r 2 ( 3 )
Fig. 26 Structure of serial I/O2 control register
S e r i a l I / O 2 r e g i s t e r ( 8 )
b 7
1 / 8
1 / 1 6
1 / 3 2
1 / 6 4
1 / 1 2 8
1 / 2 5 6
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
b 0
S e r i a l I / O 2 c o n t r o l r e g i s t e r
( S I O 2 C O N : a d d r e s s 0 0 1 D
I n t e r n a l s y n c h r o n o u s
c l o c k s e l e c t i o n b i t s
I n t e r n a l s y n c h r o n o u s c l o c k s e l e c t i o n b i t s
S e r i a l I / O 2 p o r t s e l e c t i o n b i t
S
T r a n s f e r d i r e c t i o n s e l e c t i o n b i t
S e r i a l I / O 2 s y n c h r o n o u s c l o c k s e l e c t i o n b i t
C o m p a r a t o r r e f e r e n c e i n p u t s e l e c t i o n b i t
R D Y 2
0 : I / O p o r t
1 : S
0 : I / O p o r t
1 : S
0 : L S B f i r s t
1 : M S B f i r s t
0 : E x t e r n a l c l o c k
1 : I n t e r n a l c l o c k
0 : P 0
1 : R e f e r e n c e i n p u t f i x e d
MITSUBISHI MICROCOMPUTERS
b 2 b 1 b 0
0 0 0 : f ( X
0 0 1 : f ( X
0 1 0 : f ( X
0 1 1 : f ( X
1 1 0 : f ( X
1 1 1 : f ( X
O U T 2
R D Y 2
o u t p u t e n a b l e b i t
0
/ P 3
, S
s i g n a l o u t p u t
R E F
C L K 2
I N
I N
I N
I N
I N
I N
) / 8 ( f ( X
) / 1 6 ( f ( X
) / 3 2 ( f ( X
) / 6 4 ( f ( X
) / 1 2 8 ( f ( X
) / 2 5 6 ( f ( X
i n p u t
D a t a b u s
s i g n a l o u t p u t
C I N
C I N
C I N
C I N
C I N
C I N
1 6
) / 8 i n l o w - s p e e d m o d e )
) / 1 6 i n l o w - s p e e d m o d e )
) / 3 2 i n l o w - s p e e d m o d e )
) / 6 4 i n l o w - s p e e d m o d e )
)
3886 Group
) / 1 2 8 i n l o w - s p e e d m o d e )
) / 2 5 6 i n l o w - s p e e d m o d e )
S e r i a l I / O 2
i n t e r r u p t r e q u e s t