By O.N. Bishop
ISBN-10: 0859342115
ISBN-13: 9780859342117
This e-book describes over 60 modular digital circuits - how they paintings, how one can construct them, and the way to exploit them. The modules should be stressed out jointly to make 1000's of other digital platforms, either analogue and electronic. to teach the reader the right way to commence construction structures from modules, a range of over 25 digital structures are defined intimately, overlaying such greatly differing purposes as timing, domestic safety, dimension, audio (including an easy radio receiver), video games and handheld remote control
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Additional info for Electronic Modules and Systems for Beginners
Example 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.
Electronic Modules and Systems for Beginners by O.N. Bishop
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