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SN8F2280 参数 Datasheet PDF下载

SN8F2280图片预览
型号: SN8F2280
PDF下载: 下载PDF文件 查看货源
内容描述: 8位微控制器 [8-Bit Micro-Controller]
分类和应用: 微控制器
文件页数/大小: 163 页 / 3660 K
品牌: SONIX [ SONIX TECHNOLOGY COMPANY ]
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SN8F2280 Series  
USB 2.0 Full-Speed 8-Bit Micro-Controller  
12.7 ADC CONTORL NOTICE  
12.7.1 ADC SIGNAL  
The ADC high reference voltage is internal Vdd. The ADC low reference voltage is ground.  
The ADC input signal voltage range must be from high reference voltage to low reference voltage.  
12.7.2 ADC PROGRAM  
The first step of ADC execution is to setup ADC configuration. The ADC program setup sequence and notices are as  
following.  
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Step 1: Enable ADC. ADENB is ADC control bit to control. ADENB = 1 is to enable ADC. ADENB = 0 is to disable  
ADC. When ADENB is enabled, the system must be delay 100us to be the ADC warm-up time by program,  
and then set ADS to do ADC converting. The 100us delay time is necessary after ADENB setting (not ADS  
setting), or the ADC converting result would be error. Normally, the ADENB is set one time when the system  
under normal run condition, and do the delay time only one time.  
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Step 2: Select the ADC input pin by CHS[2:0], enable P4CON’s related bit for the ADC input pin, and enable ADC  
global input. When one AIN pin is selected to be analog signal input pin, it is necessary to setup the pin as  
input mode and disable the pull-up resistor by program. Also to set the P4CON, and the digital I/O  
function including pull-up is isolated.  
z
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Step 3: Start to execute ADC conversion by setting ADS = 1.  
Step 4: Wait the end of ADC converting through checking EOC = 1 or ADCIRQ = 1. If enable ADC interrupt  
function, the program executes ADC interrupt service when ADC interrupt occurrence. ADS is cleared when the  
end of ADC converting automatically. EOC bit indicates ADC processing status immediately and is  
cleared when ADS = 1. Users needn’t to clear it by program.  
¾
Example : Configure AIN0 as 12-bit ADC input and start ADC conversion then enter power down mode.  
ADC0:  
B0BSET  
CALL  
MOV  
B0MOV  
B0BCLR  
MOV  
B0MOV  
MOV  
FADENB  
Delay100uS  
A, #0FEh  
P4UR, A  
FP40M  
A, #01h  
P4CON, A  
A, #60H  
ADR, A  
; Enable ADC circuit  
; Delay 100uS to wait ADC circuit ready for conversion  
; Disable P4.0 pull-up resistor  
; Set P4.0 as input pin  
; Set P4.0 as pure analog input  
B0MOV  
MOV  
; To set 12-bit ADC and ADC clock = Fosc.  
A,#90H  
B0MOV  
B0BSET  
ADM,A  
FADS  
; To enable ADC and set AIN0 input  
; To start conversion  
WADC0:  
B0BTS1  
JMP  
B0MOV  
B0MOV  
B0MOV  
AND  
FEOC  
WADC0  
A,ADB  
Adc_Buf_Hi, A  
A,ADR  
A, 0Fh  
; To skip, if end of converting =1  
; else, jump to WADC0  
; To get AIN0 input data bit11 ~ bit4  
; To get AIN0 input data bit3 ~ bit0  
B0MOV  
.
Adc_Buf_Low, A  
.
Power_Down  
B0BCLR  
B0BCLR  
B0BSET  
FADENB  
FCPUM1  
FCPUM0  
; Disable ADC circuit  
; Enter sleep mode  
SONiX TECHNOLOGY CO., LTD  
Page 132  
Version 1.1  
 
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