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參數資料
型號: HMS87C1304AD
廠商: HYNIX SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: CMOS SINGLE-CHIP 8-BIT MICROCONTROLLER
中文描述: 8-BIT, OTPROM, 8 MHz, MICROCONTROLLER, PDSO24
封裝: SOP-24
文件頁數: 47/70頁
文件大小: 977K
代理商: HMS87C1304AD
HYUNDAI MicroElectronics
HMS87C1304A/HMS87C1302A
Jan. 2001
Preliminary
47
Figure 14-2 A/D Converter Registers
Figure 14-3 A/D Converter Operation Flow
A/D Converter Cautions
(1) Input range of AN0 to AN7
The input voltage of AN0 to AN7 should be within the
specification range. In particular, if a voltage above
VDD
(or AVref)
or below V
SS
is input (even if within the absolute max-
imum rating range), the conversion value for that channel can not
be indeterminate. 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 AVref(or VDD)and AN0 to AN7. Since
the effect
increases in proportion to the output impedance of the an-
alog input source, it is recommended that
a capacitor be con-
nected externally as shown in Figure 14-4 in order to reduce
noise.
Figure 14-4 Analog Input Pin Connecting Capacitor
ADCM
ADDRESS : EAH
RESET VALUE : --000001
-
-
ADEN
ADS2
ADS1
ADS0
ADST
ADSF
Reserved
Analog Channel Select
A/D Status bit
0 : A/D Conversion is in process
1 : A/D Conversion is completed
A/D Start bit
1 : A/D Conversion is started
After 1 cycle, cleared to “0”
0 : Bit force to zero
000 : Channel 0 (RB0/AN0)
001 : Channel 1 (RA1/AN1)
010 : Channel 2 (RA2/AN2)
011 : Channel 3 (RA3/AN3)
100 : Channel 4 (RA4/AN4)
101 : Channel 5 (RA5/AN5)
110 : Channel 6 (RA6/AN6)
111 : Channel 7 (RA7/AN7)
A/D Enable bit
1 : A/D Conversion is enable
0 : A/D Converter module shut off
and consumes no operation current
Preimnary
A/D Control Register
ADCR
ADDRESS : EBH
RESET VALUE : Undefined
ADCR7
ADCR6
ADCR5
ADCR4
ADCR3
ADCR2
ADCR1
ADCR0
A/D Result Data Register
ENABLE A/D CONVERTER
A/D START (ADST = 1)
NOP
ADSF = 1
A/D INPUT CHANNEL SELECT
ANALOG REFERENCE SELECT
READ ADCR
YES
NO
AN0~AN7
100~1000pF
Analog
Input
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