Joined: 06 Jan 2004 Posts: 812 Helped: 39 Location: USA
24 Sep 2004 8:20
Re: AT89S52
GF0 and GF1 are general purpose user defined flags which you can use it the same way you are using any of the bit addressable memory. You can use them to indicate certain state of your porgram of for any other purpose you can think of.