In-system programming: Difference between revisions

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The second method uses [[test point]]s on the board. These are specific areas placed on the printed board, or [[Printed circuit board|PCB]], that are electrically connected to some of the electronic components on the board. Test points are used to perform functional tests for components mounted on board and, since they are connected directly to some microcontroller pins, they are very effective for ISP. For medium and high production volumes using test points is the best solution since it allows to integrate the programming phase in an assembly line.

In production lines, boards are placed on a bed of nails called a [[Test fixture|fixture]]. The latter are integrated, based on the production volumes, in semiautomatic or automatic test systems called [[Automatic test equipment|ATE (automatic test equipment (ATE)]]. Fixtures are specifically designed for each board - or at most for few models similar to the board they were designed for – therefore these are interchangeable in the system environment where they are integrated. The test system, once the board and the fixture are placed in position, has a mechanism to put in contact the needles of the fixture with the test points on the board to test. The system it’s connected to, or has directly integrated inside, an ISP programmer. This one has to program the device or devices mounted on the board: for example, a microcontroller and/or a serial memory.

== Microchip ICSP ==

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=== RJ11 pinout ===

[[File:Rj11-4-6 to icsp.jpg|thumb|RJ11 to ICSP PIC programmer]]An
Microchip supports an industry standard for using [[Registered jack#RJ11|RJ11 sockets]] with an ICSP programmer is supported by Microchip. The illustration represents information provided in their data sheets. However, there is room for confusion. The PIC data sheets show an inverted socket and do not provide a pictorial view of pinouts so it is unclear what side of the socket Pin 1 is located on. The illustration provided here is '''untested''' but uses the phone industry standard pinout (the RJ11 plug/socket was originaloriginally developed for wired desktop phones).

==References==

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==See also==

*[[PIC microcontroller#Device programmers|Device Programmersprogrammers]]

{{Microchip Technology}}