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C8051F339 参数 Datasheet PDF下载

C8051F339图片预览
型号: C8051F339
PDF下载: 下载PDF文件 查看货源
内容描述: 混合信号ISP功能的Flash MCU系列 [Mixed Signal ISP Flash MCU Family]
分类和应用:
文件页数/大小: 234 页 / 3348 K
品牌: SILICON [ SILICON ]
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C8051F336/7/8/9  
26.2. C2 Pin Sharing  
The C2 protocol allows the C2 pins to be shared with user functions so that in-system debugging and  
Flash programming may be performed. This is possible because C2 communication is typically performed  
when the device is in the halt state, where all on-chip peripherals and user software are stalled. In this  
halted state, the C2 interface can safely ‘borrow’ the C2CK (RST) and C2D pins. In most applications,  
external resistors are required to isolate C2 interface traffic from the user application. A typical isolation  
configuration is shown in Figure 26.1.  
C8051Fxxx  
/Reset (a)  
Input (b)  
C2CK  
C2D  
Output (c)  
C2 Interface Master  
Figure 26.1. Typical C2 Pin Sharing  
The configuration in Figure 26.1 assumes the following:  
1. The user input (b) cannot change state while the target device is halted.  
2. The RST pin on the target device is used as an input only.  
Additional resistors may be necessary depending on the specific application.  
232  
Rev. 0.2