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ATMEGA48PA-CCU 参数 Datasheet PDF下载

ATMEGA48PA-CCU图片预览
型号: ATMEGA48PA-CCU
PDF下载: 下载PDF文件 查看货源
内容描述: [RISC Microcontroller, 8-Bit, FLASH, AVR RISC CPU, 20MHz, CMOS, PBGA32, 4 X 4 MM, 0.60 MM HEIGHT, 0.50 MM PITCH, GREEN, PLASTIC, UFBGA-32]
分类和应用: 闪存微控制器
文件页数/大小: 349 页 / 2752 K
品牌: ATMEL [ ATMEL ]
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ATmega48/88/168  
Figure 85. Arbitration Between Two Masters  
START  
Master A Loses  
Arbitration, SDAA SDA  
SDA from  
Master A  
SDA from  
Master B  
SDA Line  
Synchronized  
SCL Line  
Note that arbitration is not allowed between:  
A REPEATED START condition and a data bit.  
A STOP condition and a data bit.  
A REPEATED START and a STOP condition.  
It is the user software’s responsibility to ensure that these illegal arbitration conditions  
never occur. This implies that in multi-master systems, all data transfers must use the  
same composition of SLA+R/W and data packets. In other words: All transmissions  
must contain the same number of data packets, otherwise the result of the arbitration is  
undefined.  
203  
2545D–AVR–07/04  
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