By David Calcutt, Frederick Cowan, Hassan Parchizadeh
The 8051 structure constructed via Intel has proved to be the preferred and enduring kind of microcontroller, to be had from many makers and known for business purposes and embedded platforms in addition to being a flexible and in your price range alternative for layout prototyping, academic use and different undertaking work.
In this ebook the authors introduce the basics and functions of the 8051, then positioned them to take advantage of via sensible workouts and undertaking paintings. the result's a hugely useful studying event that may support a variety of engineers and scholars to get in the course of the steepest a part of the educational curve and develop into expert and efficient designing with the 8051. The textual content can also be supported by means of sensible examples, summaries and knowledge-check questions.
The most recent advancements within the 8051 kinfolk also are lined during this booklet, with chapters overlaying flash reminiscence units and 16-bit microcontrollers.
- Microcontroller architecture
- improvement board design
- Programming utilizing meeting language
- Programming utilizing C
- Simulation and development
- Flash microcontrollers
- Switches, automobiles, information converters and displays
- Serial facts transmission
- promenade microcontrollers
- 16-bit microcontrollers
- venture applications
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Extra resources for 8051 Microcontroller: An Applications Based Introduction
7 AJMP START END ; lists all sfr addresses ; sets start address to 0 ; short jump to START label ; puts next program line at address 0040H ; jump to PULSE if pin 0, port 1 is logic 1 ; otherwise clear pin 7 port 1 to zero ; go to START check switch ; set pin 7 on port 1 to logic 1 ; clear pin 7 on port 1 to logic 0 ; go to START check switch ; no more assembly language Initial inspection might lead to the conclusion that the output signal on port 1, pin 7 is a square wave being turned on by SETB and oﬀ by CLR.
18. 18 Selection of port 1 window The port 1 window appears and there are two rows of eight ticks; the top row represents the logic level set by the microcontroller while the lower row represents the actual level on the port pins. Ideally they should always be the same but there are times when a bad interface might load a port pin and cause it to be logic 0 when the microcontroller is assigning logic 1. When debugging complex programs it is useful to single step through complete loops; in this simple example the program is a simple loop.
DOUBLE LOOP DELAY DELAY: MOV R1,#number1 INNER: MOV R0,#number2 TAKE: DJNZ R0,TAKE DJNZ R1,INNER RET Approximately the time delay ¼ (number 1) Â (number 2) Â 12 clock cycle periods. 423 ns. Time delay ¼ 200 Â 240 Â 12 Â 90:423 ns ¼ 52:1 ms The bigger the values of number 1 and number 2, the better the approximation. The software used has simulation and the values of number 1 and number 2 can be ﬁne tuned to give the accurate delay during simulation. Summary 27 TRIPLE LOOP DELAY DELAY: OUTER: INNER: TAKE: MOV MOV MOV DJNZ DJNZ DJNZ RET R2,#number1 R1,#number2 R0,#number3 R0,TAKE R1,INNER R2,OUTER Approximately the delay=(number 1) Â (number 2) Â (number 3)Â12 clock cycle periods.