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boot strap loader in 8051 micr-controller

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hock

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boot 8051

is it possible to implement boot strap loader in 8051 micr-controller
what is the hardware needed?
Hock
 

hock

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bootstrap loader 8051

8051 is not having any internal flash which could iniciate the communication fron the uc side. if my external e2prom is blank how can i start the boot image download?
hock
 

senthilkumar

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hai,

i think before bootload we pgm the ic for bootloader pgm

bye
 

rodney25

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what you need to do is to place the boot program at the end of the extenal e2prom by a programmer, the boot pgm will initiate the serial comunication with the pc to program the e2prom from the begining, you need to do a hardware activities to enable writing to the e2prom while reading instruction.
and also you need to add to your program at statup:

reset: jz p1.0,boot_adress

witch enable you to enter the boot pragram after you lowed p1.0 at reset.

if you need more i can explan?
 

hock

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thanks to all of you, for all your help.
i will be glad if you can explain it in detail.
thanks
hock
 

LechU

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BootLoader

Some chips from DALLAS SEMICONDUCTOR have internal ROM which you can switch off with your software, so you can load program using ROM bootstrap loader, then jump to this program and switch off ROM and finally move your program to begining of RAM - DATA and PROGRAM memory must reside in the same ram area ...

Of course some versions have EPROM and even FLASH ...
 

hock

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i am using semence sab 80c535 which dose not includes any on chip flash or eeprom.
hock
 

rodney25

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this is the schematic this may help for what i have explaned before(there was something wrong in the explnation you don't need a nor).

EA must be lowed to enable external code and also check that no security bit lock for external code exeution.


if you need help on software i can help.
 

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