| ??? 02/06/07 15:00 Read: times |
#132139 - Harder than it needs to be Responding to: ???'s previous message |
Erik Malund said:
If you write a small bootloader and von Neumann-wire an EEPROM or two that supports RAM-style writing in system (such as an AT28C64B or a AT2864E), you could achieve in-system programmability without any form of clock gating or other complexities.
if he is to get another chip to avoid "any form of clock gating or other complexities", then, by Jove, it ought to be an ISP micro, not another memory chip to promulgate the workarounds for "this is what I can do with the chip I have". Erik I agree, but I don't even know what kind of EEPROM he has right now, as I don't see a whole-system schematic in this thread. There are a handful of devices that behave similar to the ones I mentioned, so I suggested he consider the approach if he has something like them. Moreover though, as you suggest, a single $10 ISP IC (and that's a big budget) could save hundreds of dollars worth of time. There are certainly more than enough derivatives from which to choose, including those that would otherwise be pin for pin replacements for his existing device. --Sasha Jevtic |
