M3850 RENESAS [Renesas Technology Corp], M3850 Datasheet - Page 27

• Manufacturer Part Number: M3850
• Description: SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
• Manufacturer: RENESAS [Renesas Technology Corp]

3850 Group (Spec.A)
Fig. 24 Structure of serial I/O1 control registers
When setting the transmit enable bit of serial I/O1 to “1”, the serial
I/O1 transmit interrupt request bit is automatically set to “1”. When
not requiring the interrupt occurrence synchronized with the trans-
mission enabled, take the following sequence.
(1) Set the serial I/O1 transmit interrupt enable bit to “0” (disabled).
(2) Set the transmit enable bit to “1”.
(3) Set the serial I/O1 transmit interrupt request bit to “0” after 1 or
(4) Set the serial I/O1 transmit interrupt enable bit to “1” (enabled).
Rev.2.10
REJ03B0093-0210
Notes on serial I/O
more instructions have been executed.
b 7
b 7
2005.11.14
b 0
b 0
S e r i a l I / O 1 s t a t u s r e g i s t e r
( S I O S T S : a d d r e s s 0 0 1 9
( U A R T C O N : a d d r e s s 0 0 1 B
U A R T c o n t r o l r e g i s t e r
T r a n s m i t b u f f e r e m p t y f l a g ( T B E )
0 : B u f f e r f u l l
1 : B u f f e r e m p t y
R e c e i v e b u f f e r f u l l f l a g ( R 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
T r a n s m i t s h i f t c o m p l e t i o n f l a g ( T S C )
0 : T r a n s m i t s h i f t i n p r o g r e s s
1 : T r a n s m i t s h i f t c o m p l e t e d
O v e r r u n e r r o r f l a g ( O E )
0 : N o e r r o r
1 : O v e r r u n e r r o r
P a r i t y e r r o r f l a g ( P E )
0 : N o e r r o r
1 : P a r i t y e r r o r
F r a m i n g e r r o r f l a g ( F E )
0 : N o e r r o r
1 : F r a m i n g e r r o r
S u m m i n g e r r o r f l a g ( S E )
0 : ( O E ) U ( P E ) U ( F E ) = 0
1 : ( O E ) U ( P E ) U ( F E ) = 1
N o t u s e d ( r e t u r n s “ 1 ” w h e n r e a d )
C h a r a c t e r l e n g t h s e l e c t i o n b i t ( C H A S )
0 : 8 b i t s
1 : 7 b i t s
P a r i t y e n a b l e b i t ( P A R E )
0 : P a r i t y c h e c k i n g d i s a b l e d
1 : P a r i t y c h e c k i n g e n a b l e d
P a r i t y s e l e c t i o n b i t ( P A R S )
0 : E v e n p a r i t y
1 : O d d p a r i t y
S t o p b i t l e n g t h s e l e c t i o n b i t ( S T P S )
0 : 1 s t o p b i t
1 : 2 s t o p b i t s
P 2
0 : C M O S o u t p u t ( i n o u t p u t m o d e )
1 : N - c h a n n e l o p e n d r a i n o u t p u t ( i n o u t p u t m o d e )
N o t u s e d ( r e t u r n “ 1 ” w h e n r e a d )
page 27 of 86
5
/ T
X
D P - c h a n n e l o u t p u t d i s a b l e b i t ( P O F F )
1 6
)
1 6
)
b 7
b 0
S e r i a l I / O 1 c o n t r o l r e g i s t e r
( S I O C O N : a d d r e s s 0 0 1 A
B R G c o u n t s o u r c e s e l e c t i o n b i t ( C S S )
0 : f ( X
1 : f ( X
S e r i a l I / O 1 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 C S )
0 : B R G o u t p u t d i v i d e d b y 4 w h e n c l o c k s y n c h r o n o u s
1 : E x t e r n a l c l o c k i n p u t w h e n c l o c k s y n c h r o n o u s s e r i a l
S
0 : P 2
1 : P 2
T r a n s m i t i n t e r r u p t s o u r c e s e l e c t i o n b i t ( T I C )
0 : I n t e r r u p t w h e n t r a n s m i t b u f f e r h a s e m p t i e d
1 : I n t e r r u p t w h e n t r a n s m i t s h i f t o p e r a t i o n i s c o m p l e t e d
T r a n s m i t e n a b l e b i t ( T E )
0 : T r a n s m i t d i s a b l e d
1 : T r a n s m i t e n a b l e d
R e c e i v e e n a b l e b i t ( R E )
0 : R e c e i v e d i s a b l e d
1 : R e c e i v e e n a b l e d
S e r i a l I / O 1 m o d e s e l e c t i o n b i t ( S I O M )
0 : C l o c k a s y n c h r o n o u s ( U A R T ) s e r i a l I / O
1 : C l o c k s y n c h r o n o u s s e r i a l I / O
S e r i a l I / O 1 e n a b l e b i t ( S I O E )
0 : S e r i a l I / O 1 d i s a b l e d
1 : S e r i a l I / O 1 e n a b l e d
R D Y 1
( p i n s P 2
( p i n s P 2
s e r i a l I / O 1 i s s e l e c t e d , B R G o u t p u t d i v i d e d b y 1 6
w h e n U A R T i s s e l e c t e d .
I / O 1 i s s e l e c t e d , e x t e r n a l c l o c k i n p u t d i v i d e d b y 1 6
w h e n U A R T i s s e l e c t e d .
7
7
I N
I N
p i n o p e r a t e s a s o r d i n a r y I / O p i n
p i n o p e r a t e s a s S
o u t p u t e n a b l e b i t ( S R D Y )
)
) / 4
4
4
t o P 2
t o P 2
7
7
o p e r a t e a s o r d i n a r y I / O p i n s )
o p e r a t e a s s e r i a l I / O 1 p i n s )
1 6
)
R D Y 1
o u t p u t p i n