barcode printing using vb.net Truth table for an R-S flip-flop. in Software

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Table 30-8 Truth table for an R-S flip-flop.
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R 0 0 1 1 S 0 1 0 1 Q Q 1 0 Q Q 0 1
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566 Basic digital principles
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Synchronous
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An R-S flip-flop output changes state as soon as the inputs change. If the inputs change at irregular intervals, so will the outputs. For this reason, the aforementioned circuit is sometimes called an asynchronous flip-flop. A synchronous flip-flop changes state only at certain times. The change-of-state times are determined by a circuit called a clock. The clock puts out a continuous train of pulses at regular intervals. There are several different ways in which a synchronous flip flop can be triggered, or made to change state. In static triggering, the outputs can change state only when the clock signal is either high or low. This type of circuit is sometimes called a gated flip-flop. In positive-edge triggering, the outputs change state at the instant the clock signal goes from low to high, that is, while the clock pulse is positive-going. The term edge triggering derives from the fact that the abrupt rise or fall of a pulse looks like the edge of a cliff (Fig. 30-6). In negative-edge triggering, the outputs change state at the instant the clock signal goes from high to low, or when the pulse is negative-going.
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30-6 Pulse edges are either positive-going or negative-going.
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Master/slave
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When two flip-flops are triggered from the same clock, or if one of the outputs is used as an input, the input and output signals can sometimes get confused. A master slave (M/S) flip-flop overcomes this bugaboo by storing inputs before allowing the outputs to change state. An M/S flip-flop consists of two R-S flip-flops in series. The first flip-flop is called the master, and the second is called the slave. The master flip-flop functions when the clock output is high, and the slave acts during the next low portion of the clock output. This time delay prevents confusion between the input and output of the circuit.
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The J-K flip-flop works just like an R-S circuit, except that it has a predictable output when the inputs are both 1. Table 30-9 shows the input and output states for this type of flip-flop. The output changes only when a triggering pulse is received. The symbol for a J-K flip-flop is shown in Fig. 30-7. It looks just like the R-S flip-flop symbol, with the addition of a third (trigger) input, labeled T.
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The counter
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Some digital circuits can be programmed to change state every so-many clock pulses. Such a circuit is called a counter. It is also often called a divider, because if the output
The register 567
Table 30-9. Truth table for a J-K Hip-flop.
J 0 0 1 1 K 0 1 0 1 Q Q 1 0 Q Q Q 0 1 Q
30-7 Schematic symbol for a J-K flip-flop.
changes state after every n input pulses, the output frequency is 1/n of the input frequency. Counters are built up by interconnecting many flip-flops. A special type of counter can be instructed to divide by any desired positive integer n. This is a programmable divider. It forms the heart of a digital frequency synthesizer, an oscillator whose frequency can be digitally set. You learned about this circuit back in chapter 25.
The register
A register is a combination of flip-flops that can delay digital signals, or store them for a short time.
Shift registers
In a shift register, the flip-flops pass signal bits along from one to the next each time a triggering pulse is received. The most common use for a shift register is to produce a timed delay in digital data. Any input signal to a shift register will eventually arrive at the output. The output bits occur in the same order as the input bits, except later. The length of the delay can be set by changing the clock (triggering) pulse frequency. Higher clock frequencies result in less delay, and lower frequencies result in more delay.
Storage registers
In a storage register, a byte, word, or group of words is held for awhile for later use. This allows the circuit to work as a small-capacity, short-term memory. Storage registers are common in digital computers.
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