| ??? 11/09/04 17:17 Read: times |
#80824 - Congratulations! Responding to: ???'s previous message |
Kerim said:
Pin 2.4 HAS to be 'LOW'. I wonder how you get the idea to make it that way and not keep it unconnected since according to Atmel it doesn't have any role! Well, as Kai had already explained nicely why P2.4 is needed for AT89S52, the AT89S52 has 8K flash so requires another address line. But I wonder why you had to supply P2.4 as well for a 4K device.Amazingly AT89C51 works without any signal on P2.4 while AT89S52 requires a low at P2.4 Anyway it was good to know that your problem has been solved. |
