how are uC programmed in large scale

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Hi,
just wondering how are micro controllers programmed in a large quantity.
for eg. A toy manufacturing company using uC in the toy. is there a particular method for doing that or it comes programmed from the manufacturer once specified.

sorry I am a newbie and trying to learn more. it would be great if any of you experts can help.

Thanks in advance.

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You can have it programmed from the supplier or distributer.

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Thnks for the reply. coming to the main issue, I have got 2 digital thermostats with me. one with

1) PIC 18LF4620 chip on it and other with

2) TI's M430

Is it possible to edit the programming on any of those chip? so that i can do my own hacks. if yes do i need to make any programmer myself or can be bought readymade. what attracts me is its got a nice LCD screen, relay and few other bits.

Thanks.

nanovate wrote:
You can have it programmed from the supplier or distributer.

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It all depends on how the boards were manufactured. If they were programmed after they were populated, the PCBs should have some kind of programming port. If not, then you'll have to solder some kind of programming cable to the board. This could be tricky if the controllers are surface mounted. You might have to follow some traces around until you find a suitable pad.

Definitely get the data sheets and see how they are supposed to be programmed. Then see if there are traces to those pins.

As for the programmers, it's probably simplest to buy one from either Microchip or TI.

Then you need the right compiler/assembler...

Regards,
Paul

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The chips may also be locked from further reading/verify of the program load.

PIC has an ICSP connector ... look at their ICD2
TI uses either Spy-biwire or JTAG