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Se le c t Clo ck So u r ce o f Ti m e r s an d Co u n t e r
Jumpers JP1, JP2 and JP3 are used to select the clock source of Timer
0, Timer 1 and Counter 2, respectively. Short the upper two pins of
the jumpers to select an external clock source, or short the lower two
pins to select an internal clock source. However, the internal clock
source of Timer 1 is connected to the output of Timer 0, so shorting
the upper two pins of JP2 results in the cascading of Timer 0 and
Timer 1 as a 32-bit timer.
N
N
N
N
N
a
a
a
a
a
m
m
m
m
m
e
e
e
e
e
s
s
s
s
s
f o
f o
f o
f o
f o
J
J
J
J
J
u
u
u
u
u
m
m
m
m
m
p
p
p
p
p
e
e
e
e
e
s r
s r
s r
s r
s r
J
P
A
, 0
J
P
A
: 1
J
u
m
p
e
s r
f
r o
p
r o
s t
A
, 0
A
1
J
P
B
, 0
J
P
B
: 1
J
u
m
p
e
s r
f
r o
p
r o
s t
B
, 0
B
1
J
P
C
0
, L
J
P
C
1
: L
J
u
m
p
e
s r
f
r o
o l
w
n
b i
b
e l
f o
p
r o
s t
C
, 0
C
1
J
P
C
0
, H
J
P
C
1
: H
J
u
m
p
e
s r
f
r o
h
g i
h
n
b i
b
e l
f o
p
r o
s t
C
, 0
C
1
J
P
: 1
i T
m
r e
0
J
P
: 2
i T
m
r e
1
J
P
: 3
C
o
u
t n
r e
2
J
P
4
Table 2-1: Summary of jumper settings
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F
F
F
F
F
u
u
u
u
u
n
n
n
n
n
t c
t c
t c
t c
t c
o i
o i
o i
o i
o i
n
n
n
n
n
d
d
d
d
d
e
e
e
e
e
s
s
s
s
s
c
c
c
c
c
i r
i r
i r
i r
i r
t p
t p
t p
t p
t p
o i
o i
o i
o i
o i
n
n
n
n
n
1
S
e
s t
p
o
t r
a
s
a
n
o
u
p t
t u
p
o
t r
S
e
s t
p
o
t r
o t
b
e
s
f o
w t
a
e r
1
o c
f n
g i
u
a r
b
e l
a
s
n i
p
t u
r o
o
u
p t
t u
d (
e
a f
u
) t l
1
n I
e t
n r
l a
o c
u
t n
r e
c
o l
k c
o s
u
c r
e
E
x
e t
n r
a
c l
o
u
t n
r e
c
o l
k c
1
o s
u
c r
e
d (
e
a f
u
) t l
1
l A
p l
r o
s t
e r
u t
n r
o t
s
a t
e t
h
e
d l
u j
t s
p
i r
r o
o t
e r
s
t e
l A
p l
r o
s t
e r
u t
n r
o t
d
e
a f
t l u
s
a t
e t
s
f (
r o
s
f o
w t
a
e r
s -
t e
1
p
o
t r
) s
r o
o t
o
u
p t
t u
p
o
, t r
o
u
p t
t u
o l
w
f (
r o
u j
m
p
r e
s -
t e
p
o
t r
) s
Chapter 2 Installation
9
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