By Jonathan W. Valvano
ISBN-10: 1111426252
ISBN-13: 9781111426255
Embedded Microcomputer structures: actual Time Interfacing offers an in-depth dialogue of the layout of real-time embedded platforms utilizing 9S12 microcontrollers. This ebook covers the features of interfacing, complex software program issues (including interrupts), and a platforms method of usual embedded purposes. this article sticks out from different microcomputer structures books as a result of its balanced, in-depth therapy of either and software program matters vital in actual time embedded platforms layout. It incorporates a wealth of exact case reviews that display simple suggestions within the context of tangible operating examples of platforms.
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Extra info for Embedded Microcomputer Systems: Real Time Interfacing
Example text
In order to make the system easier to use and to assist in testing, a liquid crystal display (LCD) is added. The sensor converts motor speed into an electrical voltage. The amplifier converts this signal into the 0 to ϩ5V voltage range required by the ADC. The ADC converts analog voltage into a digital sample. The ADC routines, using the ADC and timer hardware, collect samples and calculate voltages. Next, this software uses a table data structure to convert voltage into measured speed. The user will be able to select the desired speed using the Keypad interface.
The I/O ports are organized into groups and placed at the bottom of the graph. 10, shows only the high-level hardware/software modules. A detailed call-graph would include each software function and I/O port. Normally, hardware is passive and the software initiates hardware/software communication, but as we will learn in Chapter 4, it is possible for the hardware to interrupt the software and cause certain software modules to be run. In this system, the timer hardware will cause the ADC software to collect a sample at a regular rate.
Even so, each 8-bit unsigned integer has a unique set of values such that the dot-product of the values times the basis yields that number. For example, 69 is (0,1,0,0,0,1,0,1)•(128,64,32,16,8,4,2,1), which equals 0*128ϩ1*64ϩ0*32ϩ0*16ϩ0*8ϩ1*4ϩ0*2ϩ1*1. 20: Give the representations of decimal 35 in 8-bit binary and hexadecimal. 21: Give the representations of decimal 200 in 8-bit binary and hexadecimal. One of the first schemes to represent signed numbers was called one’s complement. It was called one’s complement because to negate a number, you complement (logical not) each bit.
Embedded Microcomputer Systems: Real Time Interfacing by Jonathan W. Valvano
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