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As previously said, the choosen working mode is selected by mean of dip-switches see again figure 4 – Components placement and tracks layout.

I have not any problem with the clock generated by the crystal, up to 20 MHz, therefore I don’t use RE6. As already said, take care to avoid any conflict among supply sources.

While designing this circuit I tried to realize a versatile circuit and, in the same time, I also pursued the possibility to mount only the components one wish, making this D. If you wish to contact me for informations and suggestions: Take a great care to avoid conflicts among the different supply sources, and keep in mind that also connecting together two common or “ground”, or “earth” terminals of two different power sulpplies can seriously damage your circuits!

This board, in fact, allows the PIC to be interfaced with external circuits in a reliable and versatile way, making it possible to blame just the external circuits in case of electrical problems, and, of course, to concentrate just on the software. If, in whichever way, you wish to divulge such changes, it is compulsory to ask a written permit to the author of this article also by e-mail.

Should you need it, you must cut the track to be able to use the needed holes RE6 can be a resistor, a trimmer, etc. See details in the section “Programming”. This project is entirely personal; an acknowledgement goes to the software allowing me to realize the circuit’s layout. To check the horizontal scale, you could measure as an example the distance between the two holes of a resistor; it must be mils, that is 2.

If you want, before reading now the description of the various characteristics of this circuit, to have an idea of what this board can allow you to do you could take a look at something practical, that is how to set switches for normal operations. When you click on a link of an image i.

74HCN NXP Semiconductors, 74HCN Datasheet

Being this material at free disposal of whoever desires it, 74jc541n is absolutely forbidden any form of use for commercial purposes. Suggestions of any kind to allow me to improve the circuit are well accepted.

The fuse should stop the input voltage to the when the current sunk is higher than the nominal value of the fuse; the fuse should protect the external datashete supply in input to thebut has no effect on the supply connected through JP8 or JP9; besides, in case of short-circuit, it is not sure at all that it is able to avoid damages to the chip, the programmer, possible external circuits and to the power supply itself, whichever connector J1, JP8 or JP9 this one is connected to S7 inserts the LED Datashset, which shows the presence of supply to the PIC, whereever it comes from from thethrough S1, from JP9 through S5 or from JP8 through S6 The LED D4 shows the presence of a voltage between the pins 1 and 2 of the connector JP8; when S and S are closed, that supply is the one feeding also the PIC from thethrough S1, or from the programmer, through JP9 and S5, or from JP8.


Another example in the figure 4 at dpi – Components placement and tracks layout; the dpi version, printable with good quality, can be reached at the section layoutbut it requires to be loaded a longer time than the dpi version, apt to have a look at it. It is the program PCB Elegance v.

Solution: Here is…

Of course, only one clock source must be selected. I don’t datasheeet of course any direct or indirect responsibility for direct or indirect damages to things or person coming from informations got from this article.

At a first sight it could seem difficult, but you can soon realize it is a very simple procedure, in the same time allowing you a versatile use of the board.

In the section “Programming” operations to carry on are reported in details for the various kinds of programmers, their supply and the LVP bit of the PIC. Set, in the following order datssheet also figure E1: If you want, instead of reading now the descriptions of the many connectors and dip.

Here the enlarged dpi schematic. Such facility should be anyway not necessary, as the PIC has an internal circuit with the same function.

I have choosen to use a switch for each pin that sometimes has to be insulated or connected to other particular pins i.

There is anyway a mA fuse; see warnings about the fuse on the components’ list. Images needed to realize the circuit If you wish to realize the Development Board after reading, in particular, the “Acknowledgement and disclaimers” sectionyou can find here the datzsheet to save the images you need at dpireachable anyway in other points of this page. Normal operations How to set switches to select the different working modes We will now describe hot to set up the switches in the different working modes.

If you haven’t saved them yet, through the links in the beginning of this page, you can do it now. 74uc541n is a good practice, if not really necessary, after programming, that is during the normal working, to insulate the PIC from the programmer opening all the switches of S5.


If you know hot to do, you could also calculate the characteristics of a heat-sink to be mounted on the A reference to the switch Sx-1 points out the first switch of the dip.

You can find a bit further some images describing how to set up the switches in the most usual working modes. Although it’s theoretically possible to use other forms of supply, this Development Board v.

Functions of connectors and dip-switches If you want, instead of reading now the descriptions of the many connectors and dip. Set, in the following order see also figure E Remark on how to identify switches and connectors’ pins References to a particular switch of the dip-switch Sx will be made as Datassheet, the same convention for connectors JPx.

The Development Board v. Through S and S the Osc1 and Osc2 pins are connected to the connector JP1, allowing to carry those signals to an external circuit or to receive them from it.

If the port should be uses as an input, such current should be supplied by the circuit connected to RB3, and this could change the daatasheet level. If you are in doubt with regard to the size of the image you have printed, and you are in fear that it is not in true size, you can just measure the distance between holes for DIL components, which must be 2.

In the figure n. Fare click qui per la versione Italiana Best view with x Enter your search terms Submit search form. S5 – Connection to programmers It is a 6-ways dip switch related to the programming.

74HC541N – BUFFER/DRIVER,SINGLE,8-BIT,HC-CMOS,DIP,20PIN,PLASTIC From old datasheet system

As soon as the chip is programmed, it is enough to carry out the inverse operation so having the PIC ready again and connected to the external world. The minimum value in the RC net is the value of R4. Here some examples on how to setup dip switches. Depending on the program, it can be useful or necessary to reset the PIC by S4.

If you wish an answer, please write your address. Copper side layout at dpi KB Components side layout at dpi KB Components placement silkscreen at dpi KB Electrical schematic at dpi KB Components placement and track view at dpi KBor, still good quality, Components placement and track view at dpi KB Why so many dip-switches?