72
All
and more about Sha
rp
PC-1500 at http:/lwww.PC-1500
.info
0 DOB register
TI
1c register used to det
erm
ine
th
e
dir
ection
of
th
e port PB.
Selection
of
the input/ output
po
rt is the same as in the
DOA
r
eg
ister.
DOB
ca
n r
ea
d/
wr
ite data when the r
eg
ister is selected (
110
1)
.
© OPA register
OPA
7 6 5 4 3 2 0
I
The
OPA register is t
he
buffer for i
nput
and
output
of
data
to the p
or
t PA.
In
the case
of
output.
DDAi
must be set to "I»
(o
utput
mode)
and
the register
mu
st be
selected
(1110), then the
data
on
the bus line is l
oa
ded intoOPAi. to
be
output
on
PAi.
In the case of input,
DD
Ai
must be
se
t to
"O"
(input mode)
wh
i
ch
proh
ibits
ou
tput
from
OP
Ai. then the
co
ntents of
PA
i are
Hea
ded into
OP
Ai
and
the
da
ta is sent
on
th
e bus
line.
0 OPB register
The
OPB
register is the buffer for i
npu
t
and
output
of
data to the
pon
PB.
It
has the same function as the O
PA
regi
st
er.
OPB
can
read/
wri
te
data
wh
en
the ·register is selected (1111).
© OPC register
The
OPC
register
can
r
ead
/ w
ri
te
data
when the register is selected (
IOOO
).
Also. the contents of the
data
bu
s
can
be latched to the
OPC
register at the falling edge
of
the external in
pu
t clock
P<t>
.
© F register
The
F register
ca
n read/
wr
ite
da
ta when the register is selected
(01
11
).
F0
-2 determines the clock rate
of
the modulation clock FX
and
FJ
-5 the modulation
clock
of
FY.
X
_]
F6
_]
F5
_]
F4
j
F3
J F2
_]
Fl
_]
FO
_i
1
i Determines the
mo
dul
ation
cl
ock
rate of FX. J
{ De
ter
min
es t
he
mo
du
l
at
ion
clo
ck rate of FY. J
Cl
oc
k rate
0 0 0
<P
+
64
0 0 1
<P
+ 1
28
Change
of
SDO
outpu
t
mode
0 1 0
<P
+ 2
56
0 J
No
rmal serial
dat
a tr
ansfe
r
0 1
1
4>
+ 5
12
1 J
Modu
la
ted
serial data transfer
1
0 0
<I>+
10
24
Do not sell this PDF !! !
To Next Page
