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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SECTION 2.6 : 8051 FLAG BITS AND THE PSW REGISTER Like any other microprocessor , the 8051 has a flag register to indicate arithmetic conditions such as the carry bit . The flag register in the 8051 is called the program status word ...
CY , the carry flag This flag is set whenever there is a carry out from the d7 bit . This flag bit is affected after an 8 - bit addition or subtraction . It can also be set to 1 or 0 direct- ly by an instruction such as " SETB C " and ...
ANL C , source - bit Function : Flag : Logical AND for bit variable CY In this instruction the carry flag bit is ANDed with a source bit and the result is placed in carry . Therefore , if source bit = 0 , CY is cleared ; otherwise , the ...
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The 8051 Microcontrollers
THE 8051 MICROCONTROLLERS 223 Section 1 1 Microcontrollers and Embedded Processors
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