__IO what is

Discussion created by lpcware Employee on Jun 15, 2016
Latest reply on Jun 15, 2016 by lpcware
Content originally posted in LPCWare by blasiis on Wed May 26 00:39:25 MST 2010
LPCXpresso with LPC1758
Sorry for my simply question, but I need to undestand the difference from

__IO uint32_t tx_head;


uint32_t tx_head

I have tested in ram and ther'isnt difference !!