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EM78P259NSO14J 参数 Datasheet PDF下载

EM78P259NSO14J图片预览
型号: EM78P259NSO14J
PDF下载: 下载PDF文件 查看货源
内容描述: [EM78Q153SN EM78P153SP EM78P153SN EM78156EH EM78156EP EM78156EM EM78156EKM EM78Q156ELP EM78Q156ELM EM78Q156ELKM EM78P156ELP EM78P156ELM EM78P156ELKM EM78P156NP EM78P156NM EM78447SH EM78447SAP EM78447SAM EM78447SAS EM78447SBP EM78447SBWM EM78Q447SH EM78Q447SAP EM78Q447SAM EM78Q447SBP EM78Q447SBWM EM78P447SAP EM78P447SAM EM78P447SAS EM78P447SBP EM78P447SBWM EM78Q257 EM78Q257AP EM78Q257AM EM78Q257BP EM78Q257BM EM78P257AP EM78P257AM EM78P257BP EM78P257BM EM78451H EM78451P EM78451AQ EM]
分类和应用:
文件页数/大小: 81 页 / 2574 K
品牌: ELAN [ ELAN MICROELECTRONICS CORP ]
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EM78P258N  
8-Bit Microprocessor with OTP ROM  
6.7 Analog-To-Digital Converter (ADC)  
The analog-to-digital circuitry consisted of a 4-bit analog multiplexer; three control  
registers (AISR/R8, ADCON/R9, & ADOC/RA), three data registers (ADDATA/RB,  
ADDATA1H/RC, & ADDATA1L/RD), and an ADC with 12-bit resolution as shown in the  
functional block diagram below. The analog reference voltage (Vref) and the 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, ADDATA1H, and  
ADDATA1L. Input channels are selected by the analog input multiplexer via the  
ADCON register Bits ADIS1 and ADIS0.  
Vref  
ADC3  
ADC2  
ADC1  
ADC0  
Power-Down  
Start to Convert  
ADC  
( successive approximation )  
Fsco  
4-1  
MUX  
Internal RC  
7
~ 0  
1
0
3
4
3
11 10  
9
8
7
6
5
4
3
2
1
0
6
5
ADCON  
ADCON  
ADCON  
DATA BUS  
RF  
AISR  
ADDATA1H  
ADDATA1L  
Fig. 6-9 Analog-to-Digital Conversion Functional Block Diagram  
6.7.1 ADC Control Register (AISR/R8, ADCON/R9, ADOC/RA)  
6.7.1.1 R8 (AISR: ADC Input Select Register)  
7
6
5
4
3
2
1
0
ADE3  
ADE2  
ADE1  
ADE0  
AISR register defines the Port 5 pins as analog inputs or as digital I/O, individually.  
Bit 7 ~ 4: Not used  
Bit 3 (ADE3 ): AD converter enable bit of P53 pin  
0 = Disable ADC3, P53 acts as I/O pin  
1 = Enable ADC3 acts as analog input pin  
Bit 2 (ADE2 ): AD converter enable bit of P52 pin  
0 = Disable ADC2, P53 acts as I/O pin  
1 = Enable ADC2 acts as analog input pin  
42 •  
Product Specification (V1.0) 06.16.2005  
(This specification is subject to change without further notice)  
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