The 8051 Microcontroller and Embedded Systems, Volume 1
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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Reading latch for output port - Some instructions read the contents of an internal port latch instead of reading the status of an external pin . Table 8-5 provides the list of these instructions . For example , look at the " ANL P1 ...
Reading latch Since in reading the port , some instructions read the port and some others read the latch , we next consider the case of reading the port where it reads the internal port latch . “ ANL P1 , A ” is an example of an ...
From the above discus- Table C - 6 : Read - Modify - Write Instructions sion , we conclude that the Mnemonics Example instruction that reads the latch ANL ANL P1 , A normally reads a value , perORL ORL P1 , A forms an operation ...
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The 8051 Microcontrollers
8051 ASSEMBLY LANGUAGE PROGRAMMING
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