HP 13255 Technical Information
Download Technical information of HP 13255 Control Unit, IP Phone for Free or View it Online on All-Guides.com.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
13255
General
Purpose
Asynchronous
Data
Comm
Mndule
13255·Ql089/16
Rev
AlJG-Ol-76
3.2.2
The
3-to-R
decoder
provides
control
siqnals
to
the
other
functlon~l
------
---
----
_
...
_-
--
blocks.
Address
lines
ADORO,
AODR2,
ADDR3,
AOOR5,
ADDR6,
and
WRITE
and
I/O
are
dpcoded
and
strobed
bY
REO
to
realize
lowinq
control
~lqnals
are
activated
as
shown
module
address
Is
---
-
......
-
I/O
WRTTr;:
AODRO
0
0
X
0
0
X
0
,.
X
0 1
1
0
,.
0
0
1
X
0 X
0
X
0
t
X
0
X
selected.
---
---
AOOP2
ADDP3
X
X
X
X
X
X
X X
X X
X
X
0
X
t
X
X 0
X
1
X =
Don't
Care
+ =
Rising
Edqe
_
...
-
....
---
ADOR5
AOOR6
1
0
0
0
1
0
0
1
1
1
1
0
0
0
0
0
0
0
0
control
pUlse~.
The
fo1-
whenever
the
proper
REO
t
T,oad
control
regis-
ter
from
data
hus.
t
Load
character
into
transmit
half
of
HART.
0
Gate
firmware
control
word
onto
data
bus.
0
Gate
status
word
onto
data
hU5.
0
C:ate JTlodlfied
status
word
onto
data
bus.
0
Gate
received
data
from
UAFT
to
data
bus.
'Reset
UART's
Data
Ready
flip-flop
+
Set
XECL
hiqh
+
Set.
XECIJ
low
+
Turn
CD
off
+
Turn
CD
on