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C8051F502-IM 参数 Datasheet PDF下载

C8051F502-IM图片预览
型号: C8051F502-IM
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: 微控制器和处理器外围集成电路PC时钟
文件页数/大小: 312 页 / 2813 K
品牌: SILICON [ SILICON ]
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C8051F50x-F51x  
21.1. Software Interface with the LIN Controller  
The selection of the mode (Master or Slave) and the automatic baud rate feature are done though the LIN0  
Control Mode (LIN0CF) register. The other LIN registers are accessed indirectly through the two SFRs  
LIN0 Address (LIN0ADR) and LIN0 Data (LIN0DAT). The LIN0ADR register selects which LIN register is  
targeted by reads/writes of the LIN0DAT register. The full list of indirectly-accessible LIN registers is given  
in Table 21.4 on page 210.  
21.2. LIN Interface Setup and Operation  
The hardware based LIN controller allows for the implementation of both Master and Slave nodes with  
minimal firmware overhead and complete control of the interface status while allowing for interrupt and  
polled mode operation.  
The first step to use the controller is to define the basic characteristics of the node:  
Mode—Master or Slave  
Baud Rate—Either defined manually or using the autobaud feature (slave mode only)  
Checksum Type—Select between classic or enhanced checksum, both of which are implemented in hard-  
ware.  
21.2.1. Mode Definition  
Following the LIN specification, the controller implements in hardware both the Slave and Master operating  
modes. The mode is configured using the MODE bit (LIN0CF.6).  
21.2.2. Baud Rate Options: Manual or Autobaud  
The LIN controller can be selected to have its baud rate calculated manually or automatically. A master  
node must always have its baud rate set manually, but slave nodes can choose between a manual or auto-  
matic setup. The configuration is selected using the ABAUD bit (LIN0CF.5).  
Both the manual and automatic baud rate configurations require additional setup. The following sections  
explain the different options available and their relation with the baud rate, along with the steps necessary  
to achieve the required baud rate.  
21.2.3. Baud Rate Calculations: Manual Mode  
The baud rate used by the LIN controller is a function of the System Clock (SYSCLK) and the LIN timing  
registers according to the following equation:  
SYSCLK  
baud_rate = --------------------------------------------------------------------------------------------------------------------  
prescaler + 1  
2
divider multiplier + 1  
The prescaler, divider and multiplier factors are part of the LIN0DIV and LIN0MUL registers and can  
assume values in the following range:  
Table 21.1. Baud Rate Calculation Variable Ranges  
Factor  
Range  
prescaler  
multiplier  
divider  
0…3  
0…31  
200…511  
Important Note: The minimum system clock (SYSCLK) to operate the LIN controller is 8 MHz.  
202  
Rev. 1.1