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14 MICROCONTROLLERS
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Figure 2-2 An 8-bit microcontroller.
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connects to the various chip components through an 8-bit data path. Figure 2.2 illustrates this concept. Of the various microcontroller types, 8-bit microcontrollers have the largest market share. In 1999, the market for 8-bit chips was $4.8 billion. In comparison, the combined 16-bit and 32-bit chip market was merely $452 million only. Smaller 4-bit controllers also exist and have a small market share. Controllers with larger data paths can perform better than similar controllers with smaller data paths. However, controllers with smaller data paths also have cheaper development tools compared to controllers with bigger data paths. Eight-bit controllers are the most popular devices not only because of lower device cost (compared to 16- or 32-bit devices) but also because the development tools for 8-bit devices cost much less, and 8-bit devices are now being offered with increased performance and more integrated peripheral components. Besides the classification based on the size of the internal data path, microcontrollers are also classified on the basis of the underlying architecture. The next section looks at architectural aspects of the microcontroller.
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2.1 Microcontroller Architecture
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Microcontroller architecture is classified on the basis of various features. One very common classification is on the basis of a number of instructions: CISC (complex instruction set computer), RISC (reduced instruction set computer), or MISC (minimal instruction
MICROCONTROLLER ARCHITECTURE 15
set computer). However, these terms have been much muddled by marketing personnel. A CISC processor often has many RISC-like features, and it has become very confusing. Another classification is on the basis of way the program and data memory is accessed; a unified memory model is called the Princeton or Von Neumann architecture versus the Harvard architecture, which offered separate memory for program storage and data storage. Another classification is on the basis of the way the internal data is stored and manipulated inside the CPU. A microcontroller s job is to manipulate data. A microcontroller (or a microprocessor) manipulates data with the help of a user program. The way this data is stored and accessed internally in the CPU and the way it is processed forms the basis of different processor architectures and yet another classification scheme. There are four basic models: stack, accumulator, register-memory, and register-register (known as load-store). To understand the differences between these various architectures (on the basis of internal data manipulation) let us consider code sequences for performing the following computation: C A B where A, B, and C are variables. A stack machine performs this computation as follows:
Push A Push B Sub Pop C
In a stack machine, the ALU gets all operands from the stack and stores all operands back on the stack. To load a variable on the stack, an instruction Push Var is used. A stack operates by putting the last value on the top. The ALU accesses the top two values on the stack and performs any given operation (addition, subtraction, division, etc.). The result is stored back on the stack at the topmost location. An accumulator machine performs this computation as follows: In the accumulator machine, one of the operands is always the accumulator. In fact, all operations are accumulator centric.
Load A; Loads accumulator with variable A Sub B; subtracts variable B from the contents of the accumulator and stores the result back in accumulator Store C; stores the value of the accumulator, which has the result, in variable C
A register-memory machine performs this computation as follows:
Load Rx, A; loads a register Rx with variable A Sub Rx, B; subtracts the variable B from the contents of register Rx and stores the result in Rx Store C, Rx; stores the contents of Rx which is the result in variable C
A register-register machine performs this computation as follows:
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