HT46R47
·
When the A/D conversion is completed, the A/D
interrupt request flag is set. The EOC bit is set
to ²1² when the START bit is set from ²0² to ²1².
The LVR uses the ²OR² function with the exter-
nal RES signal to perform chip reset.
The relationship between VDD and VLVR is
shown below.
Bit Bit Bit Bit Bit Bit Bit Bit
Register
7
6
5
4
3
2
1
0
V
D
D
V
O
P
R
ADRL D0
¾
¾
¾
¾
¾
¾
¾
5
.
5
5
V
.
5
V
ADRH D8 D7 D6 D5 D4 D3 D2 D1
* D0~D8 is A/D conversion result data bit
LSB~MSB.
V
L
V
R
3
.
3
V
Low voltage reset - LVR
3
.
0
V
The microcontroller provides low voltage reset
circuit in order to monitor the supply voltage of
the device. If the supply voltage of the device is
within the range 0.9V~3.3V, such as changing a
battery, the LVR will automatically reset the
device internally.
0
.
9
V
Note: VOPR is the voltage range for proper chip
operation at 4MHz system clock.
The LVR includes the following specifications:
·
The low voltage (0.9V~3.3V) has to remain in
their original state to exceed 1ms. If the low
voltage state does not exceed 1ms, the LVR
will ignore it and do not perform a reset func-
tion.
S
T
A
R
T
E
O
C
*
7
6
T
A
D
*
7
6
T
A
D
P
C
R
0
~
P
C
R
2
0
0
0
0
0
0
B
B
1
0
0
1
0
0
B
B
1
0
0
0
0
0
B
B
0
0
0
B
A
C
S
0
~
A
C
S
2
*
*
X
X
X
B
P
O
R
o
w
e
r
S
c
t
a
r
t
o
f
A
/
S
c
D
t
a
r
t
o
f
1
2
A
:
:
/
D
A
A
l
/
l
P
B
l
i
n
e
i
s
d
i
g
i
t
a
l
n
o
n
v
e
r
s
i
o
n
o
n
v
e
r
s
i
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n
D
c
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n
v
e
r
t
e
r
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s
p
o
w
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e
s
e
t
t
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r
e
d
u
c
e
p
o
w
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r
c
o
n
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R
e
s
e
t
A
/
D
R
e
s
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t
A
/
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c
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r
t
e
r
c
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r
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c
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d
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f
A
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D E
n
c
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d
o
f
A
/
r
D
1
2
*
(
:
:
D
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e
f
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c
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a
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a
l
o
g
c
h
a
n
n
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l
*
*
3
:
S
e
l
e
c
t
A
D
C
c
l
o
c
k
E
x
a
m
p
l
e
:
4
c
h
a
n
n
e
l
,
A
N
2
,
f
S
Y
/
S
8
)
N
o
t
"
"
"
e
*
*
*
:
"
*
*
A
/
D
c
o
n
v
e
r
t
i
n
g
t
i
m
e
i
s
7
6
T
A
D
"
*
X
X
X
B
m
e
a
n
s
d
o
n
'
t
c
a
r
e
"
A
D
C
S
Y
c
/
S
2
l
S
o
,
Y
/
c
S
8
f
S
k
,
Y
/
S
m
f
2
u
s
t
b
e
f
Rev. 1.40
21
July 18, 2001
ETC [ ETC ]
