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By Muhammad Ali Mazidi, Janice Gillispie Mazidi, Rolin D. McKinlay

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Microcontroller versus general-purpose microprocessor What is the difference between a microprocessor and rnicrocontrollcr? ). These microprocessors contain no RAM, no ROM, and no I/O ports on the chip itself. For this reason, they are commonly referred to as general-purpose microprocessors. i. I I RAM ROM VO Port Timer Serial COM Port T I I I Addresss bus , CPU I/O RAM Timer I eSSor ystem Contrasted With M' Icrocontroller System A system dcsigner using a general . Pcmium or the 68040 must add RAM RO~urpose mlcroproccssor such as the makc them functional.

Central processing unit; it can be consideredthe "brain" or the computer; it executes the pro. grams and controls all other devices in the computer. 7. The address bus carries Ihe location (address) needed by the CPU; the data bus carries information in and out ofthe CPU; the control bus is used by the CPU 10 send signals controlling I/O devices, (aJ bidirectional (b) unidirectional 64K. or 65,536 byres Arithmetic/logic unit; it performs all arithmetic and logic operations It IS for temporary storage of information It holds the address of the next instruclion to be executed, It tells the CPU what steps to perform for each instruction, R.

It has 4K bytes of flash ROM. Notice the AT89C51-12PC, where "C" before the 51 stands for CMOS, which has a low power consumption, "12" indicates 12 MHz, "P" is for plastic DIP package, "C" is for commercial. CHAPTER 1: THE 8051 MICROCONTROLLERS 31 · 6 V . of 8051 From Almel (All ROM Flash) Table ,-; erslOns ROM RAM I/O pins Timer Interrupt Part Number 'A'T89C51 4K 128 32 2 6 AT89LV51 4K 128 32 2 6 AT89CIOSI IK 64 15 I 3 AT89C20S1 2K 128 IS 2 6 AT89C52 8K 128 32 3 8 AT89LV52 8K 128 32 3 8 Note: "C" in thc part number indicates CMOS.

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The 8051 Microcontroller and Embedded Systems Using Assembly and C by Muhammad Ali Mazidi, Janice Gillispie Mazidi, Rolin D. McKinlay


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