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SN8A1704A 参数 Datasheet PDF下载

SN8A1704A图片预览
型号: SN8A1704A
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: 145 页 / 774 K
品牌: SONIX [ SONIX TECHNOLOGY COMPANY ]
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SN8P1700  
8-bit micro-controller build-in 12-bit ADC  
EXTERNAL HIGH-SPEED OSCILLATOR  
SN8P1700 can be operated in four different oscillator modes. There are external RC oscillator modes, high  
crystal/resonator mode (12M code option), standard crystal/resonator mode (4M code option) and low crystal mode  
(32K code option). For different application, the users can select one of satiable oscillator mode by programming code  
option to generate system high-speed clock source after reset.  
Example: Stop external high-speed oscillator.  
B0BSET  
B0BSET  
FSTPHX  
FCPUM0  
; To stop external high-speed oscillator only.  
; To stop external high-speed oscillator and internal low-speed  
; oscillator called power down mode (sleep mode).  
OSCILLATOR MODE CODE OPTION  
SN8P1700 has four oscillator modes for different applications. These modes are 4M, 12M, 32K and RC. The main  
purpose is to support different oscillator types and frequencies. High-speed crystal needs more current but the low one  
doesn’t. For crystals, there are three steps to select. If the oscillator is RC type, to select “RC” and the system will  
divide the frequency by 2 automatically. User can select oscillator mode from Code Option table before compiling. The  
table is as follow.  
Code Option  
Oscillator Mode  
Remark  
Output the Fcpu square wave from Xout pin.  
32768Hz  
RC mode  
32K  
00  
01  
10  
11  
12M  
4M  
12MHz ~ 16MHz  
3.58MHz  
OSCILLATOR DEVIDE BY 2 CODE OPTION  
SN8P1700 has an external clock divide by 2 function. It is a code option called “High_Clk / 2”. If “High_Clk / 2” is  
enabled, the external clock frequency is divided by 8 for the Fcpu. Fcpu is equal to Fosc/8. If “High_Clk / 2” is disabled,  
the external clock frequency is divided by 4 for the Fcpu. The Fcpu is equal to Fosc/4.  
Note: In RC mode, “High_Clk / 2” is always enabled.  
OSCILLATOR SAFE GUARD CODE OPTION  
SN8P1700 builds in an oscillator safe guard (OSG) to make oscillator more stable. It is a low-pass filter circuit and  
stops high frequency noise into system from external oscillator circuit. This function makes system to work better under  
AC noisy conditions.  
SONiX TECHNOLOGY CO., LTD  
Page 60  
Revision 1.94  
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