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| 型號(hào)： | M37544 |
| 廠商： | Renesas Technology Corp. |
| 英文描述： | SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| 中文描述： | 單芯片8位CMOS微機(jī) |
| 文件頁數(shù)： | 31/68頁 |
| 文件大?。?/td> | 579K |
| 代理商： | M37544 |
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7544 Group
Rev.1.04 2004.06.08 page 31 of 66
REJ03B0012-0104Z
A/D Converter
The functional blocks of the A/D converter are described below.
[A/D conversion register] AD
The A/D conversion register is a read-only register that stores the
result of A/D conversion. Do not read out this register during an A/
D conversion.
[A/D control register] ADCON
The A/D control register controls the A/D converter. Bit 2 to 0 are
analog input pin selection bits. Bit 4 is the AD conversion comple-
tion bit. The value of this bit remains at “0” during A/D conversion,
and changes to “1” at completion of A/D conversion.
A/D conversion is started by setting this bit to “0”.
[Comparison voltage generator]
The comparison voltage generator divides the voltage between
AV
SS
and V
REF
by 256, and outputs the divided voltages.
[Channel selector]
The channel selector selects one of ports P2
5
/AN
5
to P2
0
/AN
0
,
and inputs the voltage to the comparator.
[Comparator and control circuit]
The comparator and control circuit compares an analog input volt-
age with the comparison voltage and stores its result into the A/D
conversion register. When A/D conversion is completed, the con-
trol circuit sets the AD conversion completion bit and the AD
interrupt request bit to “1”. Because the comparator is constructed
linked to a capacitor, set f(X
IN
) to 500 kHz or more during A/D con-
version.
Fig. 33 Structure of A/D control register
Fig. 34 Block diagram of A/D converter
b7 b0
Analog input pin selection bits
000 : P2
0
/AN
0
A/D control register
(ADCON : address 0034
16
, initial value: 10
16
)
Disable (returns “0” when read)
1 : Conversion completed
0 : Conversion in progress
AD conversion completion bit
Disable (returns “0” when read)
111 : Disable
110 : Disable
101 : P2
5
/AN
5
100 : P2
4
/AN
4
011 : P2
3
/AN
3
010 : P2
2
/AN
2
001 : P2
1
/AN
1
A/D control register
(Address 0034
16
)
C
A/D control circuit
Resistor ladder
V
REF
Comparator
A/D interrupt request
b7
b0
Data bus
3
10
P2
0
/AN
0
P2
1
/AN
1
P2
2
/AN
2
P2
3
/AN
3
P2
4
/AN
4
P2
5
/AN
5
(Address 0035
16
)
V
SS
A/D conversion register (low-order)
■
Notes on A/D converter
The comparator uses internal capacitors whose charge will be lost
if the clock frequency is too low.
Make sure that f(X
IN
) is 500 kHz or more during A/D conversion.
As for AD translation accuracy, on the following operating condi-
tions, accuracy may become low.
(1) Since the analog circuit inside a microcomputer becomes sen-
sitive to noise when V
REF
voltage is set up lower than Vcc
voltage, accuracy may become low rather than the case
where V
REF
voltage and Vcc voltage are set up to the same
value..
(2) When V
REF
voltage is lower than [ 3.0 V ], the accuracy at the
low temperature may become extremely low compared with
that at room temperature. When the system would be used at
low temperature, the use at V
REF
=3.0 V or more is recom-
mended.
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