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Michael Karas
02/13/12 09:01
Read: 682 times
Beaverton Or
USA


 
#185893 - Here is How!!
Responding to: Per Westermark's previous message
Quoting from the Atmel AT89LP8052 data sheet Section 7.3:

The RST pin of the AT89LP51/52 can function as either an active-low reset input or as an active high
reset input. The polarity of the RST pin is selectable using the POL pin (formerly EA). When
POL is high the RST pin is active high with an on-chip pull-down resistor tied to GND. When
POL is low the RST pin is active low with an on-chip pull-up resistor tied to VDD. The RST pin
structure is shown in Figure 7-3. In Compatibility mode the reset pin is sampled every six clock
cycles and must be held active for at least twelve clock cycles to trigger the internal reset. In
Fast mode the reset pin is sampled every clock cycle and must be held active for at least two
clock cycles to trigger the internal reset.

Michael Karas

List of 42 messages in thread
TopicAuthorDate
89LP52      Rick Gebhardt      02/12/12 23:58      
   Drop In Replacement??      Michael Karas      02/13/12 00:15      
   Always give full part numbers!      Andy Neil      02/13/12 00:52      
      STK500, AVRStudio et al.      Jan Waclawek      02/13/12 01:55      
         Officially recommended      Per Westermark      02/13/12 02:51      
      AT89LP Developer Studio      Michael Karas      02/13/12 09:55      
         LP ISP Studio      Jan Waclawek      02/13/12 11:12      
   Reset?      Per Westermark      02/13/12 01:15      
      hitting the nail on the head?      Erik Malund      02/13/12 07:10      
         'LP5x accepts both polarities of reset      Jan Waclawek      02/13/12 07:47      
            How?      Per Westermark      02/13/12 07:55      
               Care to read the fine manual, Per? :-)      Jan Waclawek      02/13/12 07:59      
                  don't know about Per, I would not ....      Erik Malund      02/13/12 09:10      
                  Information can sometimes be hidden      Per Westermark      02/13/12 09:13      
               Here is How!!      Michael Karas      02/13/12 09:01      
   Program      JecksonS Ben      02/13/12 01:58      
      UART-ISP? I doubt it.      Jan Waclawek      02/13/12 05:24      
         Uart-SPI      JecksonS Ben      02/14/12 03:34      
            UART bootloader      Jan Waclawek      02/14/12 12:46      
               UART bootloader      Erik Malund      02/14/12 13:13      
               already inside      JecksonS Ben      02/15/12 03:10      
                  IAP don't mean boot loader exists      Per Westermark      02/15/12 04:47      
                     IAP for flash      JecksonS Ben      02/16/12 01:21      
                  two mistakes      Erik Malund      02/15/12 10:12      
                     ISP sometimes supported with zero boot loader      Per Westermark      02/15/12 10:24      
               Atmel..      JecksonS Ben      02/16/12 01:49      
   89LP52      Rick Gebhardt      02/13/12 18:21      
      Thanks for the reply!      Andy Neil      02/14/12 00:46      
      OH, NO        Erik Malund      02/14/12 07:42      
         FLIP is Atmel's PC-side utility for UART bootloaders      Jan Waclawek      02/14/12 12:57      
            FLIP      JecksonS Ben      02/16/12 01:15      
   STK500 RS232 link commands      Jim Granville      02/15/12 22:13      
      yet another choice..      Jim Granville      02/16/12 16:31      
      AT89LP52      Rick Gebhardt      02/21/12 01:35      
      AT89LP52      Rick Gebhardt      02/21/12 01:42      
         Programmers for AT89S and AT89LP        KONSTANTINOS L. ANGELIS      02/21/12 02:16      
            AT89LP52      Rick Gebhardt      02/21/12 23:15      
               AT89ISP      Jim Granville      02/22/12 00:12      
                  I'd be wary      Erik Malund      02/22/12 09:55      
                     way      JecksonS Ben      02/24/12 01:07      
            The very very low cost solution      JecksonS Ben      02/22/12 01:24      
         AT89LP52 options      Jim Granville      02/21/12 02:27      

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