4.2
DIGITAL SECTION
4.2.1
THEORY OF OPERATION
The Processor and
Bus
(Refer to the Processor
1/0 Logic Schematic in the DRAWINGS
section
of
this
The
is
a specialized high-speed processor intended for
signal processing applications. Despite
its
unique properties, it
operates much like any other microcomputer from a hardware
standpoint.
Program store
is
provided by the
two high-speed
(U2
U3).
These connect to the bus and are selected directly by the
assertion
of
Select/)
,
and
U6,
an
provides the chip select signals decoded in the
microprocessor way by expanding the lower address
lines.
is
used
to trigger
a
watchdog timer,
at regular intervals.
If
processor operation should fail, the watchdog reacts by asserting
RES/ to the processor, thus restarting it. The watchdog also
provides a reliable reset when the
V power supply drops below
4.5
v.
U5
is
an output port
used
for the meter as well
as
for the control
input to the CODECS
U12
and
13.
U4
is
an input
port
which
is
used
to communicate button
status
to
the processor.
The CODECS have
outputs. One
of
these
is
used
to operate
the line and
"A"
relays as well as the ON and
OFF LEDS.
provides current drive to the relay, while the appropriate
sections drive the
CODEC Interface
The CODECS are interfaced serially to the
through its on-
board serial port. Each CODEC
is
programmed to occupy a time
slot on the serial bus.
26
ON€
TECHNICAL DATA
and
TROUBLESHOOTING
Summary of Contents for CS9500
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