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參數(shù)資料
| 型號(hào)： | HMS81C20XXA |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | CMOS Single-Chip 8-Bit Microcontroller with A/D Converter & VFD Driver |
| 中文描述： | CMOS單芯片8位微控制器與A / D轉(zhuǎn)換器 |
| 文件頁數(shù)： | 65/107頁 |
| 文件大小： | 1482K |
| 代理商： | HMS81C20XXA |
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HMS81C2012A/2020A
SEP. 2004 Ver 2.00
61
Figure 13-3 A/D Converter Operation Flow
A/D Converter Cautions
(1) Input range of AN11 to AN0
The input voltage of AN11 to AN0 should be within the
specification range. In particular, if a voltage above A
VDD
or below AVSS
is input (even if within the absolute maximum
rating range), the conversion value for that channel can not be in-
determinate. The conversion values of the other channels may
also be affected.
(2) Noise countermeasures
In order to maintain 8-bit resolution, attention must be paid to
noise on pins AVDD and AN11 to AN0. Since
the effect in-
creases in proportion to the output impedance of the analog
input source, it is recommended that
a capacitor be connected
externally as shown in Figure 13-4 in order to reduce noise.
Figure 13-4 Analog Input Pin Connecting Capacitor
(3) Pins AN11/R73 to AN8/R70 and AN7/R67 to AN0/
R60
The analog input pins AN11 to AN0 also function as input/
output port (PORT R7 and R6) pins. When A/D conver-
sion is performed with any of pins AN11 to AN0 selected,
be sure not to execute a PORT input instruction while con-
version is in progress, as this may reduce the conversion
resolution.
Also, if digital pulses are applied to a pin adjacent to the
pin in the process of A/D conversion, the expected A/D
conversion value may not be obtainable due to coupling
noise. Therefore, avoid applying pulses to pins adjacent to
the pin undergoing A/D conversion.
(4) AVDD pin input impedance
A series resistor string of approximately 10K
is connected be-
tween the AVDD
pin and the AVSS
pin.
Therefore, if the output impedance of the reference voltage
source is high, this will result in parallel connection
to the
series resistor string between the AVDD
pin and the AVSS
pin,
and there will be a large reference voltage error.
ENABLE A/D CONVERTER
A/D START ( ADST = 1 )
NOP
ADSF = 1
A/D INPUT CHANNEL SELECT
ANALOG REFERENCE SELECT
READ ADCR
YES
NO
AN11~AN0
100~1000pF
Analog
Input
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| HMS81C20XXA-HK | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:CMOS Single-Chip 8-Bit Microcontroller with A/D Converter & VFD Driver |
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