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All
and
more
about Sharp
PC-1500
at
http://www.PC-1500.info
2-1. Outline of LH5801
6
The L.H580
I
Microprocessor
is
"
CMOS static
8-bit
micro
processor that
features
low
po,ver
dissipation
pcrforrnancc
inherent
10
CivlOS
l
..
SJ and hu·ge
capacity
data
processing.
'.\lot
<1nly
that.
it
enable~
to
to
configure
a
variety
of
sys.tcn1s
\Vith .a
fc\v
additional
chips
because
such
as the LCD back plate
signa
l
generator. input
port.
e.
x tcrna
l
latch
clock.
and timer a
re
built in
the
1.H5801.
Features of the LH5801
<D
8-biit parallel darn
processing
CD
Direct
11cccssing
of
I
28K
b,·tcs
(j)
Us<::
of a
6-bytc
general
purpose
register.
in
addition
to
the
accum.ul:uor.
allows
to
con·
1
prise
three
pairs
of
2~hyte
date
poi
nters.
(•)
9-bit timer ca
pability
0
Three kinds
of interrupts
•
Non-maskable
interrupt
•
Maskablc
interrupt
•
·rirncr
interrupt
©
82
instruction set
0)
WAIT
function
(memory
access
control
possible)
©
Clock
P<b fo
r input
pon
(8-bit) a
nd
external latch
CD
Memory
b<1ck up function
(
BFJ.
BFO)
@
LCD
back
plate
signal
control
@
External
crystal
connection
for
clock
gl~ncration
@
)~ed ucing
prograrn
steps
by
n1eans
of
28-kind
~inglt
step vector
sul>routine
jurnp
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