AT89S52

[giaracam]

Hi to everyone! I just need some information on how I would be able to enable the watchodg timer for the AT89S52 atmel microcontroller...
Thanx in advance!! Your help will be much appreciated!!

 

[Nigel Goodwin]

Hi to everyone! I just need some information on how I would be able to enable the watchodg timer for the AT89S52 atmel microcontroller...
Thanx in advance!! Your help will be much appreciated!!

I don't know anything about Atmel processors, but on a PIC you simply set a bit in the config fuses when you program it. Presumably this processor does something similar?, but it should be explained in the datasheet.

 

[StupidDum]

I am using a Dallas 8052, not sure if it is exactly match with Atmel's.
Below are some codes written in C:

CKCON|=0X80; // set watchdog time
TA=0xAA; // time access to watchdog timer
TA=0X55;
WDCON|=0x1; // restart watchdog timer

TA=0xAA;
TA=0x55;
WDCON|=0x2; // enable watchdog timer



the TA=0xAA, and TA=0x55 are to be written to gain access to watchdog. After certain period, the access to WDCON will be closed.