HP 13255 Technical Information

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Brand: HP

Category: Control Unit , IP Phone

Type: Technical information for HP 13255

Pages: 37

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13255
General
Purpose
Asynchronous
Data
ro~m
Module
13255-910SQ/tl
Rev AUG-Ol-76
Tahle
6.2
Module Bus
Pin
Assiqnments
-====;:======================:===================================================
,
,
I
t
I
,
I
I
I
I
I
I
Function
I I
Bus
pertorme~:
Input
Module
status
Byte
I
Value
I
Siqnal
-------
... -----------
-----
...
~
----~---
...
---
X
ADDR
15
Poll
Bit:
Not
Applicable
X
AOOR
14
X
AODR
13
Module
Address:
(AODR
11,10,9,4)
=
(Atl,AtO,A9,A4)
X
AonR
12
Switch
Selectabl~
(OOOl)=Data
Comm
("101)=Prlnter
Function
50eclfier:
ADOPS
= 1
ADDR6 = 0
AO
= 0 Read
Standard
status
AO
= 1 Read
Alternate
5tatus
nata
Bus
Bit
Interpr~tation:
Alternate
status
Is
the
same
as
the
standard
status
unless
noted
otherwise
~7
Not Used
Bib
0 =
58
On
1 =
SR
Off
RS
0 =
C,",
On
1 =
C8
nff
B''l
S.)
s:l
Ai
810
0
=
CF
On
1
=
CF
Off
0
=
NO
parity
Error
1
=
P~rltv
Error
0
=
NO
Overrun
Error
1
=
Overrun
Error
o =
Transmit
Hold~nq
Reqister
Full
1 =
Transmit
Holdino
Reaist~r
Empty
o =
Receiver
Req~ster
Empty
1 =
Receiver
Reqister
Full
At
1
AOOR
11
AtO
ADnR
10
A9
ADOR
9
X
ADDR
8
X
ADOR
1
0
AOOR
6
1
ADOR
5
A4
AOOR
4
X
ADOR
3
X
ADOR
2
X
ADDR
1
AO
ADOR
0
---
..
---
-------...
---~
-------
----
..
-...
-----
87
BUS
7
86
BUS
6
85
AUS
5
84
AU~
4
83
BUS
3
B2
AUS
2
B1
PUS
1
BO
8US
0
~----~-~-~----~-~---
-------~--------~---
l=Loqical
l=Bus
LOw
O=Loqical
O=Bus
High
X=Don't
Care
------~---~----~~----
---~--~-~~-~---------
(Alternate)
o =
Transmission
in
Proqress
1 =
Transmission
Complete
=====:================================================::::=:::=:=::::==:=:=::=::=