11.4 Intel 80486 Microprocessor The Intel 80486 is an enhanced 80386 microprocessor with on-chip floating-point hardware. 11.4.1 Intel80486/80386 Comparison Table 11.2 compares the basic features of the 80486 with those of the 80386. 11.4.2 Special Features of the 80486 The Intel 80486 is a 32-bit microprocessor, like the Intel 80386. It executes the complete instruction […]
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Posts by Farahat
80386 Instruction Set
11.3.5 80386 Instruction Set The 80386 can execute all 16-bit instructions in real and protected modes. This is provided in order to make the 80386 software compatible with the 8086. The 80386 uses either 8- or 32-bit displacements and any register as the base or index register while executing 32-bit code. However, the 80386 uses […]
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80386 pins and signals , 80386 modes , 80386 system design and 80386 i/o
11.3.5 80386 Pins and Signals The 80386 contains 132 pins in Pin Grid Array (PGA) or other packages. Figure 11.2 shows functional grouping of the 80386 pins. A brief description of the 80386 pins and signals is provided in the following. The # symbol at the end of the signal name or the- symbol above […]
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Intel and motorola 32- & 64-bit microprocessors : typical features of 32-bit and 64-bit microprocessors , intel 32-bit and 64-bit microprocessors , intel 80386 , internal80386 architecture , processing modes , basic 80386 programming model and 80386 addressing modes
INTEL AND MOTOROLA 32- & 64-BIT MICROPROCESSORS This chapter provides a summary of the basic features of 32- and 64-bit microprocessors manufactured by Intel and Motorola. Intel 80386 and Motorola 68020 are covered in detail while an overview of the other 32-bit microprocessors is also included. Finally, a brief coverage of the 64-bit microprocessors is […]
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Questions and problems
QUESTIONS AND PROBLEMS 10.1 What are the basic differences between the 68000,68008,68010, and 68012? 10.2 What D0es a HIGH on the 68000 FC2 pin indicate? 10.3 (a) If a 68000-based system operates in the user mode and an interrupt occurs, what will the 68000 mode be? (b) If a 68000-based system operates in the supervisor […]
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68000 exception handlin , 68000/2732/6116/6821-based microcomputer , multiprocessine with the 68000 using the tas instruction and the as sienal .
10.13 68000 Exception Handlin : A 16-bit microcomputer is usually capable of hanD1ing unusual or exceptional conditions. These conditions include situations such as execution of illegal instruction or division by zero. In this section, the exception-hanD1ing capabilities of the 68000 are described. The 68000 exceptions can be divided into three groups, namely, groups 0, 1, […]
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68000 memory interface , 68000 i/o , 68000 programmed i/o , 68000/6821 interface , 68000/68230 interface , 68000 interrupt system , external interrupts , internal interrupts , 68000 interrupt map , 68000 interrupt address vector , an example of autovector and nonautovector interrupts , interfacing a typical aid converter to the 68000 using autovector and nonautovector interrupts and 68000 dma .
10.10 68000 Memory Interface One of the advantages of the 68000 is that it can easily be interfaced to memory chips with various speeds because it goes into a wait state if DTACK is not asserted (LOW) by the memory devices at the end of S4. A simplified schematic showing an interface of a 68000 […]
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68000 clock and reset signals , 68000 clock signals , 68000 reset circuit and 68000 read and write cycle timing diagrams .
10.9 68000 Clock and Reset Signals This section covers generation of 68000 clock and reset signals in detail because the clock signal and the reset pins are two important signals of any microprocessor. 10.9.1 68000 Clock Signals As mentioned before, the 68000 D0es not include an on-chip clock generation circuitry. This means that an external […]
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68000 pins and signals , synchronous and asynchronous control lines , interrupt control lines , dma control lines and status lines
10.8 68000 Pins And Signals The 68000 is usually packaged in one of the following: a) 64-pin dual in-line package (DIP) b) 68-pin quad pack c) 68-terrninal chip carrier d) 68-pin grid array (PGA) Figure 10.6 shows the 68000 pin diagram for the DIP. Appendix C provides data sheets for the 68000 and support chips. […]
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68000 pins and signals , synchronous and asynchronous control lines , system control lines , interrupt control lines , dma control lines and status lines
10.8 68000 Pins And Signals The 68000 is usually packaged in one of the following: a) 64-pin dual in-line package (DIP) c) 68-terrninal chip carrier b) 68-pin quad pack d) 68-pin grid array (PGA) Figure 10.6 shows the 68000 pin diagram for the DIP. Appendix C provides data sheets for the 68000 and support chips. […]
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