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Pin Coniguration Descriptions of the various pins are given below. RST This is the reset input. This input should normally be at logic 0. A reset is accomplished by holding the RST pin high for at least two machine cycles. Power-on reset is normally performed by connecting an external capacitor and a resistor to this […]
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Minimum Microcontroller Coniguration The minimum microcontroller configurations of the 8051- and AT89C2051- based microcontroller systems are shown in Figs 1.3 and 1.4. As can be seen from these figures, only the following external components are required to have a working microcontroller: We shall be using the circuit in Fig. 1.4 in all of the projects […]
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Project Development Development of a AT89C2051 microcontroller project requires several development tools. The following is a list of the tools that are essential: • Suitable assembler or compiler which can generate machine code for the AT89C2051 microcontroller. In this book we shall be developing the projects using a C compiler. • Chip programmer suitable to […]
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Introduction The term microcomputer is used to describe a system that includes a microprocessor, program memory, data memory, and an input/output (I/O). Some microcomputer systems include additional components such as timers, counters, analogue-to-digital converters and so on. Thus, a microcomputer system can be anything from a large computer system having hard disks, floppy disks and […]
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Interrupt Control The standard 8051 and AT89C2051 provide six interrupt sources: Each interrupt is assigned a fixed location in memory and an interrupt causes the CPU tojump tothat location, where it executes the interrupt service routine. Table 1.5 gives the interrupt sources and the start of their service routines in memory. Note that the serial […]
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Microcontroller Architecture The simplest microcontroller architecture consists of a microprocessor, memory, and input/output. The microprocessor consists of a central processing unit (CPU) and the control unit (CU). The CPU is the brain of a microprocessor and is where all of the arithmetic and logical operations are performed. The control unit controls the internal operations of […]
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Architecture of the 8051 Family The 8051 is an 8-bit, low-power, high-performance microcontroller. There are a large number of devices in the 8051 family with similar architecture and each member of the family is downward compatible with each other. The basic 8051 microcontroller has the following features: • 4 Kbytes of program memory • 256 […]
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8051 Family The 8051 family is a popular, industry standard 8-bit single chip micro- computer (microcontroller) family, manufactured by various companies with many different capabilities. The basic standard device, which is the first member of the family, is the 8051, which is a 40-pin microcontroller. This basic device is now available in several configurations. The […]
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THERMAL SYSTEMS Thermal systems are encountered in chemical processes, heating, cooling and air conditioning systems, power plants, etc. Thermal systems have two basic components: thermal resistance and thermal capacitance. Thermal resistance is similar to the resistance in electrical circuits. Similarly, thermal capacitance is similar to the capacitance in electrical circuits. The across variable, which is […]
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THE IDEA OF SYSTEM CONTROL Control engineering is concerned with controlling a dynamic system or plant. A dynamic system can be a mechanical system, an electrical system, a fluid system, a thermal system, or a combination of two or more types of system. The behaviour of a dynamic system is described by differential equations. Given […]
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