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EM78P458AP bảng dữ liệu(PDF) 31 Page - ELAN Microelectronics Corp

tên linh kiện EM78P458AP
Giải thích chi tiết về linh kiện  8-BIT MICRO-CONTROLLER
PDF  76 Pages
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nhà sản xuất  EMC [ELAN Microelectronics Corp]
Trang chủ  http://www.emc.com.tw
Logo EMC - ELAN Microelectronics Corp

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EM78P458/459
OTP ROM
Fig. 11 Interrupt Input Circuit
4.7 Analog-To-Digital Converter (ADC)
The analog-to-digital circuitry consists of an 8-bit analog multiplexer, three control registers
(ADCON/R9, AD-CMP-CON/IOCA0, GCON/IOC90), one data register (ADDATA/RA) and an ADC
with 8-bit resolution. The functional block diagram of the ADC is shown in Fig. 12. The analog
reference voltage (Vref) and analog ground are connected via separate input pins.
The ADC module utilizes successive approximation to convert the unknown analog signal into a
digital value. The result is fed to the ADDATA. Input channels are selected by the analog input
multiplexer via the ADCON register Bits ADIS0, ADIS1, and ADIS2.
0
1
2
3
4
5
6
7
OP2
GCON
54
3
2
10
ADDATA
OP1
DATA BUS
ADC4
ADC3
ADC2
ADC1
ADC5
ADC6
ADC7
ADC8
Vref
Power-Down
Fsco
Internal
RC
4-1
MUX
2
3
4
3
4
ADC
( successive approximation )
3
0
1
0
1
2
AD-CMPCON
RF
AD-CMPCON
ADCON
ADCON
+
+
-
-
Start to Convert
Fig. 12 The Functional Block Diagram of Analog-to-Digital Conversion
This specification is subject to change without prior notice.
06.25.2004 (V1.4)
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