HT46R51/HT46R52
Bit No. Label
Function
ACS2
ACS1
ACS0
Analog Channel
0
1
2
ACS0
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
AN0
AN1
AN2
AN3
AN4
*
ACS1 Defines the analog channel select
ACS2
Defines the port B configuration se-
3
4
5
PCR0
lect. If PCR0, PCR1 and PCR2 are all
PCR1
zero, the ADC circuit is powered off to
PCR2
reduce power consumption
Indicates end of A/D conversion.
(0= end of A/D conversion)
*
Each time bits 3~5 change state the
A/D should be initialised by issuing a
*
6
7
EOCB
START signal, otherwise the EOCB
Analog Input Channel Selection
Note: * undefined, cannot be used
flag may have an undefined condition.
See ²Important note for A/D initialis-
ation².
Register
Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0
Starts the A/D conversion.
0®1®0= Start
START
ADRL (20H) D3 D2 D1 D0
0
0
0
0
0®1= Reset A/D converter and set
ADRH (21H) D11 D10 D9 D8 D7 D6 D5 D4
EOCB to ²1².
Note: D0~D11 is A/D conversion result data bit
LSB~MSB.
ADCR (22H) Register
PCR2
PCR1
PCR0
4
3
2
1
0
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
PB4
PB4
PB4
PB4
PB4
AN4
PB3
PB3
PB3
PB3
AN3
AN3
PB2
PB2
PB2
AN2
AN2
AN2
PB1
PB1
AN1
AN1
AN1
AN1
PB0
AN0
AN0
AN0
AN0
AN0
Undefined, cannot be used
Port B Configuration
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A
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A D C S
P
C
R
2
~
0
0
0
B
1
0
0
B
1
0
1
B
0
0
0
B
1
0
0
B
P
C
R
0
1
.
P
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0
0
0
B
0
0
0
B
0
0
1
/
B
0
1
0
B
A
C
S
0
P
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:
D
e
f
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P
B
c
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f
i
g
u
r
a
t
i
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n
2
:
S
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t
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a
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a
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t
A
D
C
t
A
D
C
t
A D C
A
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c
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t
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c
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A
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c
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r
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t
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e
N
o
t
e
:
A
t
S
Y
S
S
Y
S
S
Y
S
A
D
C
S
A
D
t
A
D
C
A
D
A/D Conversion Timing
Rev. 1.40
17
July 12, 2005
HOLTEK [ HOLTEK SEMICONDUCTOR INC ]
