The 8051 Microcontroller and Embedded Systems, Volume 1
Prentice Hall, 2000 - Digital control systems - 435 pages
For courses teaching the 8051 Microcontoller.
This book uses a step-by-step approach to teach the fundamentals of assembly language programming and interfacing of the 8051 microcontroller. It uses many examples to clarify concepts. Simple, concise examples are utilized to show what action each instruction performs, then a sample is provided to show its application. This text provides a comprehensive understanding of the internal organization of the 8051 registers and resources in a way that sheds the student's fear of assembly language. Whether students become designers of stand-alone systems or complex embedded systems, they will find this text a useful resource.
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... SBUF can be accessed like any other register in the 8051. Look at the following examples of how this register is accessed : MOV SBUF , #D MOV SBUF , A MOV A , SBUF ; load SBUF = 44H , ASCII for ' D ' ; copy accumulator into SBUF ; copy SBUF ...
... SBUF , A JNB TI , HERE CLR ΤΙ RET ; load SBUF ; wait for last bit to transfer ; get ready for next byte Importance of the TI flag To understand the importance of the role of TI , look at the following sequence of steps that the 8051 ...
... SBUF register . We copy the SBUF contents to a safe place in some other register or memory before it is lost . 5. After the SBUF contents are copied into a safe place , the RI flag bit must be forced to 0 by the " CLR RI " instruction ...
The 8051 Microcontrollers
THE 8051 MICROCONTROLLERS 223 Section 1 1 Microcontrollers and Embedded Processors
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