©
National Instruments
7-1
X Series User Manual
7
Counters
X Series devices have fo
u
r general-p
u
rpose 32-bit co
u
nter/timers and
one freq
u
ency generator. The general-p
u
rpose co
u
nter/timers can be
u
sed
for many meas
u
rement and p
u
lse generation applications. Fig
u
re 7-1
shows the X Series Co
u
nter 0 and the freq
u
ency generator. All fo
u
r
co
u
nters on X Series devices are identical.
Figure 7-1.
X Series Counter 0 and Frequency Generator
Co
u
nters have eight inp
u
t signals, altho
u
gh in most applications only a few
inp
u
ts are
u
sed.
For information abo
u
t connecting co
u
nter signals, refer to the
Default
Counter/Timer Pinouts
section.
Each co
u
nter has a FIFO that can be
u
sed for b
u
ffered acq
u
isition and
generation. Each co
u
nter also contains an embedded co
u
nter (Embedded
Ctr
n
) for
u
se in what are traditionally two-co
u
nter meas
u
rements and
Co
u
nter 0
Co
u
nter 0
S
o
u
rce (Co
u
nter 0 Time
bas
e)
Co
u
nter 0 A
u
x
Co
u
nter 0 HW Arm
Co
u
nter 0 A
Co
u
nter 0 B (Co
u
nter 0 Up_Down)
Co
u
nter 0 Z
Co
u
nter 0 G
a
te
Co
u
nter 0 Intern
a
l O
u
tp
u
t
Co
u
nter 0 TC
Inp
u
t
S
election M
u
xe
s
Freq
u
ency Gener
a
tor
Freq
u
ency O
u
tp
u
t Time
bas
e
Freq O
u
t
Inp
u
t
S
election M
u
xe
s
Em
b
edded Ctr0
FIFO
Co
u
nter 0
Sa
mple Clock
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