M38867E8AHP MITSUBISHI [Mitsubishi Electric Semiconductor], M38867E8AHP Datasheet - Page 36

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

Fig. 33 Structure of bus interface related register
36
b 7
b 7
b 7
b 0
b 0
b 0
( D B B S T S 0 : a d d r e s s 0 0 2 9
( D B B C O N : a d d r e s s 0 0 2 A
D a t a b u s b u f f e r s t a t u s r e g i s t e r 0
D a t a b u s b u f f e r c o n t r o l r e g i s t e r
D a t a b u s b u f f e r s t a t u s r e g i s t e r 1
( D B B S T S 1 : a d d r e s s 0 0 2 C
D a t a b u s b u f f e r e n a b l e b i t
D a t a b u s b u f f e r f u n c t i o n s e l e c t i o n b i t
O B F
O B F
O B F
O B F
I n p u t l e v e l s e l e c t i o n b i t
R e s e r v e d
U s e r d e f i n a b l e f l a g ( U
O u t p u t b u f f e r f u l l f l a g 0 ( O B F
I n p u t b u f f e r f u l l f l a g 0 ( I B F
A 0
U s e r d e f i n a b l e f l a g ( U
O u t p u t b u f f e r f u l l f l a g 1 ( O B F
I n p u t b u f f e r f u l l f l a g 1 ( I B F
U s e r d e f i n a b l e f l a g ( U
U s e r d e f i n a b l e f l a g ( U
A 0
0 : P 5
1 : D a t a b u s b u f f e r e n a b l e d
0 : S i n g l e d a t a b u s b u f f e r m o d e ( P 4
1 : D o u b l e d a t a b u s b u f f e r m o d e ( P 4
0 : O B F
1 : O B F
0 : P 4
1 : P 4
0 : P 4
1 : P 4
0 : P 4
1 : P 4
0 : C M O S l e v e l i n p u t
1 : T T L l e v e l i n p u t
D o n o t w r i t e “ 1 ” t o t h i s b i t .
T h i s f l a g c a n b e d e f i n e d b y u s e r f r e e l y .
T h i s f l a g c a n b e d e f i n e d b y u s e r f r e e l y .
0 : B u f f e r e m p t y
1 : B u f f e r f u l l
0 : B u f f e r e m p t y
1 : B u f f e r f u l l
T h i s f l a g c a n b e d e f i n e d b y u s e r f r e e l y .
T h i s f l a g i n d i c a t e s t h e c o n d i t i o n o f A 0
w h e n t h e I B F
0 : B u f f e r e m p t y
1 : B u f f e r f u l l
0 : B u f f e r e m p t y
1 : B u f f e r f u l l
T h i s f l a g c a n b e d e f i n e d b y u s e r f r e e l y .
T h i s f l a g i n d i c a t e s t h e c o n d i t i o n o f A 0
w h e n t h e I B F
0
1
0
0 0
0 1
1 0
f l a g ( A 0
f l a g ( A 0
o u t p u t s e l e c t i o n b i t
o u t p u t e n a b l e b i t
o u t p u t e n a b l e b i t
o u t p u t e n a b l e b i t
0
2
2
3
3
6
6
– P 5
f u n c t i o n s a s p o r t I / O p i n .
f u n c t i o n s a s O B F
f u n c t i o n s a s p o r t I / O p i n .
f u n c t i o n s a s O B F
f u n c t i o n s a s p o r t I / O p i n .
f u n c t i o n s a s O B F
0 0
0 1
v a l i d
v a l i d
0
1
3
)
)
, P 8 I / O p o r t
0
1
f l a g i s s e t .
f l a g i s s e t .
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
0 2
1 2
1 4
0 4
)
)
– U
– U
0
1
1 6
1 6
0 0
0 1
1 0
0 7
1 7
)
)
1 6
)
)
)
)
0
1
o u t p u t p i n .
o u t p u t p i n .
o u t p u t p i n .
)
)
)
MITSUBISHI MICROCOMPUTERS
7
7
f u n c t i o n s a s I / O p o r t . )
f u n c t i o n s S
0
1
s t a t u s
s t a t u s
1
i n p u t . )
3886 Group