By Muhammad Ali Mazidi
This ebook makes use of a step by step method of educate the basics of meeting language programming and interfacing of the 8051 microcontroller. It makes use of many examples to explain options. uncomplicated, concise examples are applied to teach what motion every one guide plays, then a pattern is equipped to teach its software. this article offers a complete realizing of the interior association of the 8051 registers and assets in a fashion that sheds the scholars worry of meeting language. no matter if scholars turn into designers of stand-alone structures or advanced embedded structures, they'll locate this article an invaluable source.
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Extra info for 8051 Microcontroller and Embedded Systems, The
INSIDE THE COMPUTER CPU’s Relation to RAM and ROM For the CPU to process information, the data must be stored in RAM or ROM, which are referred to as primary memory ROM provides information that is fixed and permanent ¾ Tables or initialization program RAM stores information that is not permanent and can change with time ¾ ¾ Various versions of OS and application packages CPU gets information to be processed first form RAM (or ROM) if it is not there, then seeks it from a mass storage device, called secondary memory, and transfers the information to RAM HANEL Department of Computer Science and Information Engineering National Cheng Kung University, TAIWAN 28 INSIDE THE COMPUTER Registers ¾ The CPU uses registers to store information temporarily Values to be processed Address of value to be fetched from memory Inside CPUs ¾ In general, the more and bigger the registers, the better the CPU Registers can be 8-, 16-, 32-, or 64-bit The disadvantage of more and bigger registers is the increased cost of such a CPU HANEL Department of Computer Science and Information Engineering National Cheng Kung University, TAIWAN 29 Program Counter Inside CPUs Instruction Register Flags ALU Instruction decoder, timing, and control Internal buses Register A Register B Control Bus Data Bus (cont’) Address Bus INSIDE THE COMPUTER Register C Register D HANEL Department of Computer Science and Information Engineering National Cheng Kung University, TAIWAN 30 INSIDE THE COMPUTER Inside CPUs (cont’) ALU (arithmetic/logic unit) ¾ Performs arithmetic functions such as add, subtract, multiply, and divide, and logic functions such as AND, OR, and NOT Program counter ¾ Points to the address of the next instruction to be executed As each instruction is executed, the program counter is incremented to point to the address of the next instruction to be executed Instruction decoder ¾ Interprets the instruction fetched into the CPU A CPU capable of understanding more instructions requires more transistors to design HANEL Department of Computer Science and Information Engineering National Cheng Kung University, TAIWAN 31 INSIDE THE COMPUTER Internal Working of Computers Ex.
HANEL Address 1404H is put on the address bus and the code is fetched into the CPU, decoded, and executed The contents of address 1406 are fetched in and executed This HALT instruction tells the CPU to stop incrementing the program counter and asking for the next instruction Department of Computer Science and Information Engineering National Cheng Kung University, TAIWAN 37 8051 MICROCONTROLLERS The 8051 Microcontroller and Embedded Systems: Using Assembly and C Mazidi, Mazidi and McKinlay Chung-Ping Young 楊中平 Home Automation, Networking, and Entertainment Lab Dept.
Flash Comes with on-chip loader, loading program to on-chip flash via PC COM port HANEL Department of Computer Science and Information Engineering National Cheng Kung University, TAIWAN 16 OVERVIEW OF 8051 FAMILY Various 8051 Microcontrollers DS5000 from Dallas Semiconductor ¾ Also comes with on-chip loader (cont’) OTP (one-time-programmable) version of 8051 8051 family from Philips ¾ HANEL NV-RAM (changed one byte at a time), RTC (real-time clock) ADC, DAC, extended I/O, and both OTP and flash Department of Computer Science and Information Engineering National Cheng Kung University, TAIWAN 17 8051 ASSEMBLY LANGUAGE PROGRAMMING The 8051 Microcontroller and Embedded Systems: Using Assembly and C Mazidi, Mazidi and McKinlay Chung-Ping Young 楊中平 Home Automation, Networking, and Entertainment Lab Dept.