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SN8F22711B 参数 Datasheet PDF下载

SN8F22711B图片预览
型号: SN8F22711B
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: 111 页 / 1291 K
品牌: SONIX [ SONIX TECHNOLOGY COMPANY ]
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SN8F2270B Series  
USB 2.0 Low-Speed 8-Bit Micro-Controller  
4
SYSTEM CLOCK  
4.1 OVERVIEW  
The micro-controller is a dual clock system. There are high-speed clock and low-speed clock. The high-speed clock is  
generated from the external oscillator & on-chip PLL circuit. The low-speed clock is generated from on-chip low-speed  
RC oscillator circuit (ILRC 24 KHz).  
Both the high-speed clock and the low-speed clock can be system clock (Fosc). The system clock in slow mode is  
divided by 4 to be the instruction cycle (Fcpu).  
)
)
Normal Mode (High Clock):  
Slow Mode (Low Clock):  
Fcpu = Fhosc / N, N = 1 ~ 4, Select N by Fcpu code option.  
Fcpu = Flosc/4.  
SONIX provides a “Noise Filter” controlled by code option. In high noisy situation, the noise filter can isolate noise  
outside and protect system works well. The minimum Fcpu of high clock is limited at Fhosc/4 when noise filter enable.  
4.2 CLOCK BLOCK DIAGRAM  
Fcpu Code Option  
STPHX  
HOSC  
CLKMD  
Fosc  
Fosc  
Fcpu = Fhosc/1 ~ Fhosc/4, Noise Filter Disable.  
Fcpu = Fhosc/4, Noise Filter Enable.  
Fhosc.  
Fcpu  
CPUM[1:0]  
Flosc.  
Fcpu = Flosc/4  
z
z
z
z
z
HOSC: High_Clk code option.  
Fhosc: Internal high-speed clock.  
Flosc: Internal low-speed RC clock (Typical 24 KHz).  
Fosc: System clock source.  
Fcpu: Instruction cycle.  
SONiX TECHNOLOGY CO., LTD  
Page 43  
Version 1.2