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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NOP DJNZ R3 , HERE RET DELAY : HERE : 33. Find the time delay for the delay subroutine shown to the right , if the system frequency is 16 MHz . MOV R3 , # 200 NOP NOP NOP DJNZ R3 , HERE RET DELAY : BACK : AGAIN : HERE : 34.
DJNZ byte , target Function : Decrement and jump if not zero Flags : None In this instruction a byte is decremented , and if the result is not zero it will jump to target address . Example : Count from 1 to 20 and send the count to P1 .
... ( 20 ) ACALL ( P7 ) ( 2B , 2C ] MOVX WRO , A ( 20 ) MOVX RI , A ( 20 ) 3 CPL с CLR с SETB с 4 SWAP A DA A CLR А CPL A 5 XCH A , dir ( 28 ] DJNZ dir , rel ( 3B , 2C ] MOV A , dir ( 28 ) MOV dir , A ( 28 ) 6 MOV dir ...
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The 8051 Microcontrollers
8051 ASSEMBLY LANGUAGE PROGRAMMING
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