Table of Contents
Advertisement
Rsconf( )
T h is f u n c t i o n le t s y o u c h a n g e t h e R S - 2 3 2 s e r i a l p o r t p a r a m e t e r s , s u c h a s
c o m m u n i c a t i o n s s p e e d , h a n d s h a k i n g , p a r i t y , a n d s o o n .
C macro format
i n t s p e e d , h a n d s h a k e , u c r , r s r , t s r , s c r ;
R s c o n f ( s p e e d , h a n d s h a k e , u c r , r s r , t r s , s c r ) ;
Machine language format
m o v e . w
# s c r , - ( s p )
m o v e . w
# t r s , - ( s p )
m o v e . w
# r s r , - (s p )
m o v e . w
# u c r , - (s p )
m o v e . w
# h a n d s h a k e , - (s p )
m o v e . w
# s p e e d , - (s p )
m o v e . w
# 1 5 , - ( s p )
t r a p
# 1 4
a d d .l
# 1 4 , s p
Inputs
s c r
w o r d
t s r
w o r d
r s r
w o r d
u c r
w o r d
T h e 8 - b it M F P U S A R T C o n t r o l R e g is te r :
Bit
Function
0
N o t u s e d
1
P a r i t y ty p e
0 =
O d d
1 =
E v e n
2
P a r i t y e n a b l e
0
=
O f f
2 =
O n
3 - 4
A s y n c s t a r t a n d s t o p b i ts
B its
4
3
0
0
O
i l
1 0
1 1
206
Configure RS-232 Port
S e t s t h e M F P S y n c h r o n o u s C h a r a c t e r
R e g i s t e r ( - 1
S e t s t h e M F P T r a n s m i t S t a t u s R e g i s t e r
( - 1
S e t s t h e M F P R e c e i v e S t a t u s R e g i s t e r
( - 1
S e t s t h e 8 - b i t M F P U S A R T C o n t r o l R e g i s
t e r .
N u m b e r o f s t a r t a n d s t o p b its
N o s t a r t o r s t o p b i ts ( s y n c h r o n o u s )
s t a r t b i t, 1 s t o p b it
1 s t a r t b i t, 1 1 /2 s t o p b its
1
s t a r t b i t , 2 s t o p b i ts
Rsconf
=
k e e p c u r r e n t c o n t e n t s )
=
k e e p c u r r e n t c o n t e n t s ) .
=
k e e p c u r r e n t c o n t e n t s ) .
Opcode = 15
Hide quick links:
Advertisement
Table of Contents
