please dont rip this site

8051 CPU IO Pins

Maurice Reid heeft geschreven in bericht <> RE: the datasheet specs for the 8052 pull-ups. I'm trying to drive a ULN2003 darlingron array using these ports but haven't worked out if it is possible. The port drivers are specified in terms of Iil at 0v (about -50uA). Other parts talk of the pull-up being equivalent to a 10K resistor. But the figures don't seem to add up

Maurice, If the voltage on the pin is below threshold (as with the darlingtons) a weak pullup is present. If above threshold the internal resistance is 10x lower. Use real pullups on the outside. Arie de Muynck

.8051 I/O usually outputs logic high during reset which can be a pain, as well as having weak pull ups all the time, and this can mean more external hardware considerations.



file: /Techref/8051/iopins.htm, 1KB, , updated: 2012/10/16 09:51, local time: 2024/7/17 10:12,

 ©2024 These pages are served without commercial sponsorship. (No popup ads, etc...).Bandwidth abuse increases hosting cost forcing sponsorship or shutdown. This server aggressively defends against automated copying for any reason including offline viewing, duplication, etc... Please respect this requirement and DO NOT RIP THIS SITE. Questions?
Please DO link to this page! Digg it! / MAKE!

<A HREF=""> 8051 CPU IO Pins</A>

After you find an appropriate page, you are invited to your to this massmind site! (posts will be visible only to you before review) Just type a nice message (short messages are blocked as spam) in the box and press the Post button. (HTML welcomed, but not the <A tag: Instead, use the link box to link to another page. A tutorial is available Members can login to post directly, become page editors, and be credited for their posts.

Link? Put it here: 
if you want a response, please enter your email address: 
Attn spammers: All posts are reviewed before being made visible to anyone other than the poster.
Did you find what you needed?


Welcome to!

Site supported by
sales, advertizing,
& kind contributors
just like you!

Please don't rip/copy
(here's why

Copies of the site on CD
are available at minimal cost.

Welcome to!