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Electronics
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360 slots
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Time processing unit Pulse detector Counter
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Figure 1418 Calculating the speed of rotation of the slotted wheel
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A typical application of the slotted encoder is to compute the ignition and injection timing in an automotive engine In an automotive engine, information related to speed is obtained from the camshaft and the ywheel, which have known reference points The reference points determine the timing for the ignition ring points and fuel injection pulses, and are identi ed by special slot patterns on the camshaft and crankshaft Two methods are used to detect the special slots (reference points): period measurement with additional transition detection (PMA), and period measurement with missing transition detection (PMM) In the PMA method, an additional slot (reference point) determines a known reference position on the crankshaft or camshaft In the PMM method, the reference position is determined by the absence of a slot Figure 1419 illustrates a typical PMA pulse sequence, showing the presence of an additional pulse The additional slot may be used to determine the timing for the ignition pulses relative to a known position of the crankshaft Figure 1420 depicts a typical PMM pulse sequence Because the period of the pulses is known, the additional slot or the missing slot can be easily detected and used as a reference position How would you implement these pulse sequences using ring counters
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Digital Systems
Additional slot
Missing slot
Figure 1419 PMA pulse sequence
Figure 1420 PMM pulse sequence
Registers A register consists of a cascade of ip- ops that can store binary data, one bit in each ip- op The simplest type of register is the parallel input parallel output register shown in Figure 1421 In this register, the load input pulse, which acts on all clocks simultaneously, causes the parallel inputs b0 b1 b2 b3 to be transferred to the respective ip- ops The D ip- op employed in this register allows the transfer from bn to Qn to occur very directly Thus, D ip- ops are very commonly used in this type of application The binary word b3 b2 b1 b0 is now stored, each bit being represented by the state of a ip- op Until the load input is applied again and a new word appears at the parallel inputs, the register will preserve the stored word
D CLK
D CLK
Load input b0
Figure 1421 Four-bit parallel register
The construction of the parallel register presumes that the N -bit word to be stored is available in parallel form However, it is often true that a binary word will arrive in serial form, that is, one bit at a time A register that can accommodate this type of logic signal is called a shift register Figure 1422 illustrates how the same basic structure of the parallel register applies to the shift register, except that the input is now applied to the rst ip- op and shifted along at each clock pulse Note that this type of register provides both a serial and a parallel output Data sheets for some common registers are included in the accompanying CD-ROM
Part II
Electronics
Q0 Serial input b1 D CLK Q0 D Q1
Q1 D CLK Q2
Q2 D Q3
Q3 Serial output
Clock input
Figure 1422 Four-bit shift register
Seven-Segment Display
A seven-segment display is a very convenient device for displaying digital data The display is shown in Figure 1423 Operation of a seven-segment display requires a decoder circuit to light the proper combinations of segments corresponding to the desired decimal digit
This display, with the appropriate decoder driver, is capable of displaying values ranging from 0 to 9 a b c d e f g a f g e d c b D C B A BCD to seven-segment decoder
FOCUS ON MEASUREMENTS
a b c d e f g
Figure 1424 Figure 1423 Sevensegment display
A typical BCD to seven-segment decoder function block is shown in Figure 1424, where the lowercase letters correspond to the segments shown in Figure 1423 The decoder features four data inputs (A, B, C, D), which are used to light the appropriate segment(s) The outputs of the decoder are connected to the seven-segment display The decoder will light up the appropriate segments corresponding to the incoming value A BCD to seven-segment decoder function is similar to the 2-to-4 decoder function described in 13 and shown in Figure 1361 Data sheets for seven-segment display drivers may be found in the accompanying CD-ROM
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