How to deal with pin Vpp/RPD

[xuyinghui]

Posted on August 04, 2003 at 14:41

How to deal with pin Vpp/RPD

[xuyinghui]

Posted on August 02, 2003 at 04:09

Pin84 is Vpp only for F167, then should I stick pin84 to 12V, or switch 12V on only when erasing or programming flash?

For F168, pin84 is Vpp/RPD, then how to apply 12V to pin84 and maintain RPD function(this is a simple RC circuit without Vpp)? Should I switch 12V on to pin84 only when erasing or programming flash?

[maxime2399]

Posted on August 04, 2003 at 14:41

For the F167, you can connect the pin to 12V directly, but I recomend you connect it only when programing. It will ensure an application more robust and will avoid problem at power-up/down where the 12V need to be place after the 5V and removed first.

For the ST10F168 the pin has the 2 functions, therefore you cannot let the 12V during the reset phase. Have a look at

http://www.stmcu.com/forums-cat-87-5.html

on the forum for RPD explanation and the enclosed BMP to see an example. Just a comment regarding the products: The ST10F167 has been discontinued a couple of years ago, therefore I do not recomend to use it... Even so the ST10F168 is still a valid part, I would recomend to use the ST10F269 instead: it has more feature and should be cheaper than the ST10F168 (more recent technology). For example, the 269 is single voltage programing, no need of 12V... ________________ Attachments : ST10F168_reset_circuit.bmp : https://st--c.eu10.content.force.com/sfc/dist/version/download/?oid=00Db0000000YtG6&ids=0680X000006Hzu8&d=%2Fa%2F0X0000000bYb%2FpbvPzkTAorPM.ZHkWgvClYcUnaf41F6TXVFw0ZMbwTk&asPdf=false