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LDmicro Forum - Unused Pin |
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Unused Pin (by Goran)
What to do with PGD, PGM,PGC pins (16F877A) which I use only for programing, to leave them float or make them input and with 10k resistor to GND?
(no subject) (by JOHN)
never leave float pull up/down with 10k
(no subject) (by Tom J.)
I dislike necromancing threads as much as I dislike asking stupid noob questions but here I am doing both......
I'm preparing to use a 16F877A as well, do ANY unused I/Os get pulled down with a 10k? Also would it be better for power consumption to pull them up with a 10K rather than down? Sorry guys I'm cross eyed from reading the data sheet and if there's any useful information on the subject in there I can't find it.
(no subject) (by MGP)
I never use pullups or pulldown resistors with unsused pins (except the MCLR pin).
I never had any problems, not even with a 16F628a circuit in a electric bike. If you have doubts then make them output(low), but I am sure it will work if you do nothing with those pins.
What are "best practices" for unused pins? (by Ihor Nehrutsa)
(no subject) (by Tom J.)
Still a little hazy, there's contradicting information all over the internet.
I'm going to let them float in my ptototype and if they do anything odd I'll pull them up with a 1k. Logically pulling them down means they draw power from or through the MCU.
por Tom J (by Para Ton)
los pines los puedes controlar con la resistencias internas, si te queda programa de escalera fíjate en este signo V (es una v Inversa) en las entradas v-x el signo es en positivo. todas las entradas digitales solo no las analógicas, esto lo veras cuando queremos poner una entrada digital en un cuadrado lo marcas y lo veras en el diagrama escalera = ajuste de nivel de entrada HI.
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