By Douglas Summerville
ISBN-10: 1608450082
ISBN-13: 9781608450084
ISBN-10: 1608450090
ISBN-13: 9781608450091
Nearly all of desktops in use this day are encapsulated inside of different structures. unlike general-purpose pcs that run an never-ending collection of software program, those embedded pcs are frequently programmed for a truly particular, low-level and infrequently mundane objective. Low-end microcontrollers, costing as low as one greenback, are frequently hired by means of engineers in designs that make the most of just a small fraction of the processing power of the gadget since it is both less costly than deciding on an application-specific half or simply because programmability bargains customized performance no longer differently to be had. Embedded structures Interfacing for Engineers utilizing the Freescale HCS08 Microcontroller is a two-part e-book meant to supply an advent to and software program interfacing for engineers. construction from a complete advent of primary computing innovations, the publication compatible for a primary direction in desktop association for electric or desktop engineering scholars with a minimum heritage in electronic good judgment and programming. furthermore, this ebook might be beneficial as a reference for engineers new to the Freescale HCS08 relations of microcontrollers. The HCS08 processor structure utilized in the publication is comparatively uncomplicated to benefit, strong sufficient to use in the direction of a wide-range of interfacing projects, and contains breadboard prototyping in a laboratory utilizing freely on hand and reasonably cheap instruments. partly II: electronic and Analog Interfacing, and software program interfacing strategies are brought. The emphasis of this paintings is on strong and software program engineering layout ideas. gadget drivers are built illustrating using general-purpose and special-purpose electronic I/O interfaces, analog interfaces, serial interfaces and real-time I/O processing. The part of every interface is defined and electric standards and similar concerns are thought of. the 1st a part of the booklet offers the programming talents essential to enforce the software program during this half. desk of Contents: creation to the MC9S08QG4/8 / Analog enter / Serial verbal exchange / Real-Time I/O Processing
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Extra resources for Embedded Systems Interfacing for Engineers using the Freescale HCS08 Microcontroller II: Digital and Analog Hardware Interfacing
Sample text
Starting at the label FOUNDKEY, the code uses the row and column values to determine an ASCII value for the key that was pressed. At this point in the execution of the ISR, the column number is in index register X. The row code, which is in the lower nibble of A, is a value that either has a single zero in the bit whose number is the same as the row number, or multiple zeros if keys in multiple rows are pressed. Since there are only 15 values the row can have at this point (from 00002 to 11102 ) a lookup table is used to simultaneously prioritize the rows when multiple zero’s are detected as well as compute 4×row.
17. When multiple keys are pressed, priority is given to the key with the lowest column first, then the lowest row. The driver returns the ASCII value of the key in the global variable KEYVALUE. So that the main program can tell when there is a new key value, a Boolean variable ISKEY is set by the ISR when a new key value is place in KEYVALUE. The main program must clear ISKEY after reading the key value. The driver initialization routine KBIINIT configures pins KBI4 to KBI7 as falling edge triggered inputs with KBI interrupt requests enabled.
Two types of simple mechanical switches are toggle switches and momentary switches. A toggle switch is set to the open or closed position and remains in that position until changed. A momentary switch has a normal state (open or closed) which is the state of the switch when there is no mechanical action; the switch is in the opposite state as long as the mechanical action lasts. 9. A human-actuated momentary switch is call a push-button switch. 22 CHAPTER 1. 9: Schematic symbols for common mechanical switches.
Embedded Systems Interfacing for Engineers using the Freescale HCS08 Microcontroller II: Digital and Analog Hardware Interfacing by Douglas Summerville
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