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Jan Waclawek
05/13/10 15:36
Read: 649 times
Bratislava
Slovakia


 
#175867 - parallel programming
Responding to: ???'s previous message
Let's start with the same as Erik stated: most manufacturers don't want to publish detailed information on parallel programming, so unless you run an well established business in making programmers, it's unlikely you get it. But some chips do have published parallel programming specification usually directly in the datasheet, try looking at some of Atmel's offering.

Physically, parallel programming is accomplished in a very straighforward manner: usually triggered by a certain combination of logic levels on certain pins, often involving setting one pin at a "high" voltage (above the high logic level, usually to around 12V), multiplexers on pins detach the microcontroller's circuits and attach the memory's interface, so then the chip looks just as if it would be only the memory. You know how FLASH memories are programmed, don't you?

JW

List of 19 messages in thread
TopicAuthorDate
programing on chip flash?      Douglas Brummund      05/13/10 13:44      
   of course, you are,      Erik Malund      05/13/10 14:33      
   parallel programming      Jan Waclawek      05/13/10 15:36      
   thanks everyone      Douglas Brummund      05/13/10 19:18      
      Not exactly fair      Andy Neil      05/14/10 00:48      
      too deep      Stefan KAnev      05/14/10 01:48      
         Internal voltage doublers in some chips for IAP support      Per Westermark      05/14/10 03:14      
            hm      Stefan KAnev      05/14/10 03:58      
               actually ...      Erik Malund      05/14/10 04:32      
               why to do this? I cant understand :-(      Andy Neil      05/14/10 04:37      
                  the Manzi book      Erik Malund      05/14/10 05:17      
                     You mean, "Mazidi"      Andy Neil      05/14/10 06:17      
                        agreed, and ...      Erik Malund      05/14/10 06:26      
            ISP before IAP?      Andy Neil      05/14/10 04:41      
               A question of driving force      Per Westermark      05/14/10 04:54      
      baloney      Erik Malund      05/14/10 04:35      
   programming on chip flash?      Douglas Brummund      05/17/10 20:28      
      If only it were that simple...      Andy Neil      05/18/10 00:13      
      did you read my remark above...      Jan Waclawek      05/18/10 00:47      

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