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17
1.3.5.
Control section (Refer to
Fig.
18.)
1.3.5.
1.
Microprocessor
8035
The
integrated
circuit
microprocessor
8035, one
of the
MCS-48
family of
single-chip
microcomputers forms the
basis
of the control section of the PIVI2521
automatic multimeter.
The 8035
is
the equivalent of the
8048
except
that
it
has
no
internal
program
memory.
However,
it
uses
two
externally-located read-only
memories
(2kx8-bit
EPROM's)
with
address/data
decoding
facilities
for
program
instruction storage.
In
addition to the true
bidirectional 8-line
databus, the
8035
has
two
quasi-bidirectional
8-bit
data ports for
extra address
lines
and communication
with the
external
circuits
in
the
PM2521
.
Data
written to these ports
remains
unchanged
until
rewritten.
Each
line
is
able
to serve
as
input or output, or both, even
though outputs
are
statically
latched.
The
internal
data
memory
is
a
random-access
store
of
64x8-bits, indirectly addressable
through
the
RAM
pointer
register.
Fig. 15.
Basic functional blocks
of
8035pP.
ST3369
811127
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