Model 8640B TM 9-4935-601-14-7&P
Figure 8-13. Programmable Up/Down Counter
8-12
-
-
DATA
INPUTS
DATA
OUTPUTS
~
t
~
~
-~
()
cu
COUNT
UP
LO
OA
DB
De
Do
co
COUNT
DOWN
cu
CAY
k
-
....,
CLA
MASTER
CLEAR
LD
LOAD
co
BAW
"""
-
r-
CLR
QA
QB
oc
Oo
OA
...
Do
DATA
INPUT
oA"
..
oD
DATA
OUTPUT
CRY
CARRY
BRW
BORROW
t
~
t
t
Illustrated
below
is
the
following
sequence:
1.
Clear
outputs
to
zero.
2.
load
(preset)
to
BCD
thirteen.
3.
Count
up
to fourteen, fifteen, carry,zero,
one,
and
two.
4.
Count
down
to
one,
zero,
borrow, fifteen, fourteen,
and
thirteen.
MASTER
__ll
CLEAR
LOAD
I
I
I
I
I
I
OA
_j
I I
I
I
I I
I
L---
1
r--
----------------
DB
I
-----.....!!---
--------------
_j
De
..----......i---ti
-
'-----------
......
------
Do
_j
------..-
L-.
I
COUNT
UP
COUNT
DOWN
QA
I
OB
:.J
I
Oc
:-,
I
oo
::1
I
CARRY
I
U I
BORROW
I
I
SEQUENCE
I
I
ILLUSTRATED I
0
I
I I
j13l
CLEAR
PRESET
I I
1
14
1s
o 1 2
1
l..--
COUNT
UP
__.j
NOTES:
A.
Clear
overrides
load,
data,
and
count
inputs.
I U I
1 1 o
15
14
13!
(..___COUNT
DOWN
____.!
B.
When
counting
up,
count-down
input
is
high;
when
counting
down,
count-up
input
is
high.
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
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