Embedded Microcomputer Systems: Real Time Interfacing by Jonathan W. Valvano

By Jonathan W. Valvano

Embedded Microcomputer platforms: actual Time Interfacing presents an in-depth dialogue of the layout of real-time embedded structures utilizing 9S12 microcontrollers. This booklet covers the elements of interfacing, complex software program subject matters (including interrupts), and a structures method of commonplace embedded purposes. this article stands proud from different microcomputer platforms books as a result of its balanced, in-depth remedy of either and software program matters vital in genuine time embedded platforms layout. It includes a wealth of special case reports that exhibit easy thoughts within the context of exact operating examples of structures.

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Similarly, when you write a “0” to an output port, then the output voltage goes low. 17 reveal some of the basic properties of high-speed CMOS logic. First, because of the complementary nature of the P-channel (the one on the top) and the N-channel (the one on the bottom) transistors, when the input is constant (continuously high or continuously low), the supply current, Icc, is very low. Second, the gate will require supply current only when the output switches from low to high or from high to low.

This condition can cause permanent damage to the transistors. Third, since the input A is connected to the gate of the two MOS transistors, the input currents will be very small (1 µA). In other words, the input impedance (input voltage divided by input current) of the gate is very high. Normally, a high input impedance is a good thing, except when the input is not connected. If the input is not connected, then it takes very little input currents to cause the logic level to switch. Common error: If unused input pins on a CMOS microcontroller are left unconnected, then the input signal may oscillate at high frequencies depending on the EM fields in the environment, wasting power unnecessarily.

Binary Bits Bytes Alternatives 8 10 12 16 20 24 30 32 n 1 256 1024 4096 65536 1,048,576 16,777,216 1,073,741,824 4,294,967,296 2n 2 3 4 [[n/8]] Decimal Digits Alternatives 3 31/2 33/4 4 41/2 43/4 5 n 1000 2000 4000 10000 20000 40000 100000 10n Copyright 2010 Cengage Learning. All Rights Reserved. May not be copied, scanned, or duplicated, in whole or in part. Due to electronic rights, some third party content may be suppressed from the eBook and/or eChapter(s). Editorial review has deemed that any suppressed content does not materially affect the overall learning experience.

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