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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... pull - up resistor . This is due to the fact that PO is an open drain , unlike P1 , P2 , and P3 , as we will soon ... resistors . See Figure 4-4 . In this way we take advantage of port 0 for both input and output . With external pull ...
... pull - up resistors since it already has pull - up resistors internally . Upon reset , port 1 is configured as an output port . For example , the following code will continuously send out to port 1 the alternating values 55H and AAH ...
... pull - up resistors . ( The reason is to allow it to multiplex address and data . See Chapter 14 for a detailed discussion of address / data muliplexing . ) Since PO has no internal pull - up resistors , it is simply an open - drain as ...
The 8051 Microcontrollers
THE 8051 MICROCONTROLLERS 223 Section 1 1 Microcontrollers and Embedded Processors
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