Wouter van Ooijen wrote:

>OK, disregard the 16C84. The level at which a 16F84(A) will switch to
>programming mode is specified as 12 .. 14 Volt, which I interpret as 'no
>chip will enter below 12, all chips will enter below 14'. So you need 14
>for reliable programming, which is more than 3 times the lowest voltage
>you can get from USB (plus you will have some loss in the diodes). In
>practice this won't be a big problem since most people use powered hubs,
>and most chips enter prog mode below 13 V, but IMHO it is still a design
>flaw. Note that my own Wisp628 is not entirely off the hook on this
>aspect either.
>
>
>
Yes, the F84 looks similar to the C84 in that regard. I haven't had
problems yet, but if I do I will remove it from the K128 list. The other
F series look like VCC + 3.5V for VPP as a minimum (or there abouts).

regards

Tony

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