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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If after the execution of SUBB the CY = 0 , the result is positive ; if CY = 1 , the result is negative and the destination has the 2's complement of the result . Normally , the result is left in 2's complement , but the CPL ...
If the result of an operation on signed numbers is too large for the register , an overflow has occurred and the programmer must be notified . Look at Example 6-12 . Example 6-12 Examine the following code and analyze the result .
Write a program to add all the digits of your ID number and save the result in R3 . The result must be in BCD . 3. Write a program to add the following numbers and save the result in R2 , R3 . The data is stored in on - chip ROM .
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The 8051 Microcontrollers
8051 ASSEMBLY LANGUAGE PROGRAMMING
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