JPS6036630B2 - electronic circuit equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to an electronic circuit device constituted by a large-scale integrated circuit (large-scale integrated circuit), etc., and in particular to display data to be provided to a display device or printed characters to be provided to a printing device. The present invention relates to an electronic circuit device with an improved circuit for processing data output.

BACKGROUND OF THE INVENTION FIG. 1 is a block diagram illustrating the concept of a typical prior art electronic circuit device.

For example, the electronic processing results processed by the electronic circuit device 1 consisting of 1 are often finally visually displayed by the display device 2 or printed by the printing device 3. In particular, in a small computer equipped with both a display device 2 and a printer 3, electronic processing results must be output as display data for the display device 2 and print data for the printer 3. Therefore, display data output terminals (pins) PDI to PDn and print data output terminals (pins) PPI to PPn were required. On the other hand, due to the number of pins that can be provided on one LSI chip, it is difficult to extract these data from one chip, and as shown in the figure, it is difficult to extract these data from one chip.
It was constructed using two (or three) SI chips.

Alternatively, an MSI (medium scale integrated circuit) or the like is provided between the display device 1 and the display device 2 or the printing device 3.

Problems to be Solved by the Invention However, in any case, if the above configuration is adopted, the number of LSIs will increase or an MSI will be required, and as a result, the entire device will become expensive. There was a drawback.

In addition, the display data given to the display device 2 and the printing device 3
Since the display timing of the display device 2 and the print timing of the printing device 3 are completely different from the print data given to the print data, even if the data is the same, it must be given separately.

The LSII has drawbacks such as having to incorporate two types of decoders, a decoder for display data and a decoder for print data, and the circuit configuration is complicated and large, and it is also expensive. Therefore, an object of the present invention is to provide an inexpensive electronic circuit device such as an LSI that can decode display data and print data with a common decoder, greatly simplify and downsize the circuit configuration.

Means for Solving the Problem This invention provides a combination means for supplying encoded display data, a combination means for supplying coded print data, and a common decoding of display data or print data. a decoder, an identification signal generation means for generating an identification signal for identifying display or printing, and a display timing signal supply means for supplying a relatively fast timing signal necessary for displaying display data on a display device. , a printing timing signal supply means for supplying a relatively slow timing signal necessary for printing print data by the printing device, and a holding means connected to a stage before or after a decoder.

The holding means selectively holds display data or print data to be decoded by the decoder or decoded by the decoder in response to the identification signal generated by the identification signal generating means. Further, the holding means outputs the held data at the timing of a display timing signal or a printing timing signal selectively given in response to the identification signal. Further, the electronic circuit device of the present invention includes a plurality of data output terminals for outputting decoded display data or print data to the outside at a predetermined timing via the decoder and holding means, and a plurality of identification signal generation terminals. An output terminal is provided for outputting the identification signal outputted from the means to the outside. The holding means preferably includes means for selectively serial/parallel converting display data or print data in response to an identification signal, and means for holding the parallel-converted display data or print data and converting the display data or print data into serial/parallel data in response to an identification signal. and a holding means for outputting the held data at the timing of a display timing signal or a printing timing signal given by the user.

In this case, the decoder is connected between the serial/parallel conversion means and the holding means. In addition to the action-coded display data or the coded print data, any data is selectively given to the holding means depending on the type of identification signal.

The holding means temporarily holds the given display data or print data. This holding means is selectively given a display timing signal or a printing timing signal in response to the identification signal. When any of the timing signals is applied, the holding means outputs the display data or print data held at the timing of the applied signal. The output data is then decoded by a decoder and output to an output terminal for an external device. Further, in order to indicate the type of data to be output to an external device, the above-mentioned identification data is also provided to a dedicated output terminal. The holding means may be provided before the decoder to function as described above, or may be provided after the decoder to have the same effect.

Embodiments Below, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 2 is a schematic block diagram showing the concept of the invention.

The present invention is characterized by data output terminals P1 to Pn provided from an electronic circuit device 1 to a display device 2, and data output terminals PI to Pn provided to a printing device 3. is shared by the electronic circuit device 1 side such as an LSI, and an identification signal output terminal IS is newly added for identifying whether output data is display data or print data. FIG. 3 shows a specific circuit diagram of an embodiment of the present invention.

For example, when a thermal printer is used as the printing device 3 connected to the electronic circuit device 1, segment and digit drive signals are required for both display and printing. It is also possible to share circuits, for example segment decoders and possibly digit drive circuits. The embodiment shown in FIG. 3 is an example in which a segment decoder is shared. conventionally,
Even if the print data and the display data are almost the same data, each data is individually taken out from the electronic circuit device 1 because the driving time is different. In contrast, in this embodiment, a decoder is shared, so that display data and print data can be decoded by the common decoder. Referring to FIG. 3, display data encoded by display data supply means 4 is applied to AND gate 5, and print data encoded by print data supply means 6 is applied to AND gate 7.

The AND gate 5 is activated by the inverted output from the inverter 9 when the print command signal (identification signal) generated by the identification signal generating means 8 is at the "L" level. Also, A
The ND gate 7 is activated when the print command signal is at the "H" level. The outputs of AND gates 5 and 7 are applied to NOR gate 101. That is, display data or print data is selected by the print command signal. Any selected data is applied to a register 11 consisting of bit cells 111 and 113 via a NOR gate 10, and is converted into serial/parallel data. The data converted in parallel by the register 11 is temporarily held in the succeeding 1-digit holding circuit 12 and 15, and is given to the segment decoder 6 at a predetermined timing to be decoded. Then, the output of the decoder 16 is
The signals are outputted from output terminals PI to Pn via. What should be noted here is that the print drive speed and display drive speed are different.

Therefore, if there is no holding circuit 12, the timing at which the data held for each digit in the holding circuit 15 is output must be differentiated between printing and displaying. Generally, the printing speed is slower than the display speed, so when printing, one word pulse SC is output one after another at each timing of the one-word pulse SC given from the printing timing signal coupling means 18. On the contrary,
In the case of display, since the display speed is fast, the data is read out at every fast timing of the digit clock pulse ◇ given from the display timing signal supply means 19. In this way, either the pulse SC or the pulse is selectively applied to the holding circuits 12 to 15 depending on the printing or display. For this purpose, the pulse is applied to an AND gate 20 and the pulse SC is applied to an AND gate 21. Each AND gate 20, 21 is selectively activated by a print command signal, and in the case of printing, the AND gate 21
is activated, and in the case of display, the AND gate 20 is activated. Each AND gate output is NOR gate 2
2 and the inverter 23 to the holding circuit 12 and 15. Therefore, in the holding circuits 12 and 15, held data is continuously output at the timing of the applied pulse or pulse SC, and the data is applied to the segment decoder 16. Here, the operation will be briefly explained using the case of display as an example.

In the case of display, the print command signal goes to "L" level, is inverted by inverter 9 and goes to "H" level, and AND gate 5 and AND gate 20 are activated. Accordingly, display data is applied to holding circuits 12 to 15 via AND gate 5, NOR gate 10 and register 11, while clock pulse 0 is applied to AND gate 20, NO
Holding circuit 1 via R gate 22 and inverter 23
2 to 15. As a result, the display data is successively outputted at the timing of the clock pulse and is applied to the segment decoder 16. Segment decoder 6
Then, display data is decoded and applied to output terminals PI to Pn via inverters 171 and 17n. Furthermore, in this case, whether the data output from the output terminals PI to Pn is print data or display data is distinguished by the output of the identification signal output terminal IS. It will not be driven by inappropriate signals.

Note that the decoder 6 is the holding circuit 12 in the embodiment described above.
Although it is arranged on the output side of the register 11 and the holding circuit 12, it may be arranged between the register 11 and the holding circuit 12 and the output side of the register 15. In a state where is a signal representing a print command, the print data is decoded and output at the timing when it passes through the print operation, and in a state where the identification signal is a signal representing a display command, the display data is decoded and output at the timing when it passes through the print operation. Since the data can be decoded and output at the same timing, print data or display data to be provided to printing devices or display devices having different operating speeds can be decoded by a common decoder.

Since it is possible to determine whether the output data is print data or display data by the signal output from the identification signal output terminal, the printing device or display device will not be driven by erroneous data. Therefore, according to the present invention, it is possible to provide a small and inexpensive electronic circuit device with a simplified circuit configuration. Further, according to the present invention, it is possible to provide an effective electronic circuit device for driving and controlling a printing device and a display device.

[Brief explanation of the drawing]

FIG. 1 is a block diagram illustrating the concept of a typical prior art electronic circuit device. FIG. 2 is a schematic block diagram showing the concept of the invention. FIG. 3 is a concrete circuit block diagram of an embodiment of the present invention. In the figure, 1 is an electronic circuit device such as an LSI, 2 is a display device, 3 is a printing device, 4 is a display data supply means, 6 is a print data integration means, 8 is an identification signal generation means, 1 is a resistor, 12 to 16 are single digit holding circuits,
16 is a segment decoder, 18 is a printing timing signal supply means, 19 is a display timing signal supply means, S
I to Pn are data output terminals, and IS is an identification signal output terminal. Figure 1 Figure 2 Figure 3

Claims (1)

[Scope of Claims] 1. An electronic circuit device capable of decoding display data to be provided to a display device and print data to be provided to a printing device using a built-in common decoder, which provides coded display data. a supply means for supplying coded print data, a decoder for commonly decoding the display data or print data, an identification signal generation means for generating an identification signal for identifying the display or print; Display timing signal supply means for supplying a relatively fast timing signal necessary for displaying the display data on the display device; and a relatively slow timing signal necessary for printing the print data on the printing device. printing timing signal supply means for supplying display data or print data to be decoded by the decoder or decoded by the decoder in response to the identification signal; A holding means for selectively holding data and outputting the held data at the timing of the display timing signal or the printing timing signal selectively given in response to the identification signal; the decoder; and the holding means. a plurality of data output terminals for outputting decoded display data or print data to the outside at a predetermined timing through the terminal; and a plurality of data output terminals for outputting the identification signal output from the identification signal generating means to the outside. An electronic circuit device equipped with an output terminal. 2. The holding means includes means for selectively serial/parallel converting the display data or print data in response to the identification signal; and a means for holding the parallel-converted display data or print data and responding to the identification signal. holding means for outputting the held data at the timing of the display timing signal or the printing timing signal selectively given by the decoder; It is connected. An electronic circuit device according to claim 1.