HP 8340b User Manual

A60
PROCESSOR ASSEMBLY
The
A60
processor
assembly
performs
all
instrument data
processing.
This
assembly consist
of:
• A
microprocessor
•
Memory
•
An HP-IB
interface
•
The
necessary
circuTTry
for:
clock
generation
address
and
memory
decoding
buffering
Interrupt
handling
The
microprocessor
interfaces
directly
with
memory,
which
consists
of:
•
64K
words
of
Ultra Violet
Erasable Programmable
Read
Only
Memory
(UVEPROM)
The
instrument
software program
(firmware)
is
stored
in
this
section
of
memory,
with
the
default
calibration
data.
•
2K
words
of
Electrically
Erasable
Programmable
Read
Only
Memory
(EEPROM)
Protected
calibration
data
is
stored
here,
•
8K
words
of
Random
Access Memory
(RAM)
Working
calibration
data
and
SAVE/RECALL
register values
are
stored
here.
Battery
backup
provides
power
to
RAM
when
AC
power
is
disconnected.
If
the
backup
power
fails,
working
calibration
data
and
SAVE/RECALL
information
is
lost.
When
AC
power
is
restored,
the
EEPROM
calibration
data
is
loaded
in
RAM,
and
the
front
panel
displays
CALIBRATION
RESTORED.
NOTE:
1
word
=
2
bytes;
1
byte
=
8
bits.
The
microprocessor
is
controlled
by the
firmware
stored
in
memory.
With
this
program,
the
micro¬
processor
can
transfer
data
(I/O
addressing) and internally
process
data
it
has
accessed.
All
data
transfers
go
through
the
microprocessor.
The
A60
processor
assembly
communicates
with the
rest
of
the
instrument
by
means
of
the
internal
address
and
data
busses.
External communication
is through
the
HP-IB
connection
on
the
rear panel.
The
HP-IB interface circuitry provides the
link
between
the
internal
instrument
bus
and
the
external
HP-IB
Interface.
HP 8340B/41B
Change
7
Controller Section
Theory
of
Operation
F-5/F-6

HP 8340b Specifications

General

Brand	HP
Model	8340b
Category	Inverter
Language	English