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Kai Klaas
01/02/12 09:45
Read: 407 times
Germany


 
#185269 - Even or better just then...
Responding to: David Prentice's previous message
David said:
The data sheet RC will work good enough for you as a hobbyist.

The RC reset is no longer shown in the datasheet! More, in application notes ATMEL strongly recommends to use a reset circuitry providing a proper brown-out reset.

David said:
A RESET chip will work better if you want a reliable nuclear bomb or space rocket.

Flash micros can loose the code memory content during improper reset conditions. This will even annoy the hobbyist...

David said:
Even Kai's schematic did not show 100nF decoupling capacitors. They are very important.

Of course they are. Obligatory things are often omitted in schematics for reasons of clarity. I always demand using decoupling caps at each chip!

David said:
Better still, use an 8051 variant that has a proper internal reset.

Sometimes they tend to be even more tricky...

Kai Klaas

List of 32 messages in thread
TopicAuthorDate
AT89S52 and ISP problem      Adam Collins      01/01/12 13:38      
   Quick Schematic Obversation      Michael Karas      01/01/12 18:28      
      hmm      Adam Collins      01/01/12 22:20      
         Your Reset Input      Michael Karas      01/02/12 03:56      
            Thanks!!      Adam Collins      01/02/12 07:28      
   Your schematic is wrong      David Prentice      01/02/12 03:35      
   The AT89S52 needs a reset chip!      Kai Klaas      01/02/12 05:44      
      The AVRISP-2 is a USB device      David Prentice      01/02/12 06:02      
   what an AWFUL design      Erik Malund      01/02/12 07:35      
      Isn't mine!      Adam Collins      01/02/12 08:06      
         Compare several schematics      David Prentice      01/02/12 08:16      
            Thanks!!      Adam Collins      01/02/12 08:41      
               Sink or source? Does matter a lot!      Per Westermark      01/02/12 08:50      
                  Not granted      Adam Collins      01/02/12 09:07      
                     Processor can be used      Per Westermark      01/02/12 09:20      
                        Yeah..      Adam Collins      01/02/12 09:33      
                     cure for ignorance      Erik Malund      01/02/12 11:11      
         you forgot the quotes      Erik Malund      01/02/12 08:23      
         well      Erik Malund      01/02/12 08:30      
            Funny      Adam Collins      01/02/12 08:47      
               RC resets are evul      Per Westermark      01/02/12 08:57      
                  So?      Adam Collins      01/02/12 09:02      
                     Not necessarily,,,      Kai Klaas      01/02/12 09:18      
                     I guess you are a student / hobbyist      David Prentice      01/02/12 09:19      
                        Oh..      Adam Collins      01/02/12 09:30      
                        Even or better just then...      Kai Klaas      01/02/12 09:45      
                           Where to apply 100nF?      Adam Collins      01/02/12 10:01      
                              Shortest possible distance      Per Westermark      01/02/12 10:34      
                        especially not for a hobbyist      Erik Malund      01/02/12 11:23      
                  RC RESET worked fine for years ,,, but ...      Richard Erlacher      01/02/12 20:01      
               no, not "will" but "is likely to"      Erik Malund      01/02/12 11:17      
                  an added IMPORTANT comment      Erik Malund      01/02/12 11:26      

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