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HP 8110 Α Service Guide
F
u
n
ctional
Un
its on
th
e
P
C
B
oa
rd
7- 1 4
F
u
n
ctional Description
The m ain functional units on the Microprocessor
I
C are:
ι
C
PU22 - Central Processing Unit
ι QSM - Queued Serial Module
ι
G
PT - General purpose Timer
ι
S
IM - System Integration Module
ι ΙΜΒ - Intermodule Bus
The units communicate internally using the ΙΜΒ
The Microprocessor P C B oard functional units, and what they do,
are as
f
ollows :
Unit
F
unction
1-Battery Backup and
R
eset
Sets conditions during power-up
2-Battery
S
upports the Static RAMS when the instrument
i s not
p
owered
3-Boot Control
Decides whether to
b
oot the Microprocessor
f
rom t he Flash EPROMs or from
t
he Memory
Card
4-Oscillator
Provides clock pulses for the Microprocessor
5-DBI
Device Bus Interface : Sends data to the boards
in t he instrument and reads status lines
6-Interrupts
Signal to the Microprocessor that α device or
functional unit needs attention
7-Display
S
hows the status of the instrument, and displays
waveforms
8-RPG
R
otary Pulse Generator :
P
rovides another
w
ay
o
f e ntering data in addition to the keyboard
9-Beeper
Gives an audible w arning tone and
m
akes α
'click' when α key is
p
ressed
10-HP- ΙΒ Interface
Gives α
m
eans of accessing the instrument
externally for uploading and downloading of
data, or
f
or control
11-Clock Divider
P
rovides clock pulses
f
or the HP-ΙΒ
12-Keyboard
This is the instrument's user interface
13-Memory Card Connector B oard
Contains buffers
f
or the Memory Card . The
m
emory card contains
b
attery-backed RAMS
containing different firmware and store/recall
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