salamander
Member level 2
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c515 use of xdata
Hallo
sometime ago I started a new microcontroller project an so I started to develop an Board based on the famouse Dallas 80C320 microcontroller: schematics
The parts I used: for memory adressing I used a 74HCT00 standard logic, as latch I used a 74HCT573, the uC as said a Dallas 80C320 (also tried Intel 80C32), the Eprom is a 27C256 and as ram I used a 62256[32k]...
But the problem is, it does not run
I have allready inserted the third eprom with the same program and so there is the question, did I something basicly wrong?!?
the error: wenn I power on the board(all parts inserted except the eprom)everything goes right(on both adress and databus is "action"), but when I insert the eprom the upper 8 bits of the adressbus are only rubish(some low, some high but no data).
Until now I built the board two times, but I does not run until today!
Thanks to all who read this text and had fun with by bad english...it would also be ok if you write me, that I mad everythin right 8)
thanks a lot
salamander
Hallo
sometime ago I started a new microcontroller project an so I started to develop an Board based on the famouse Dallas 80C320 microcontroller: schematics
The parts I used: for memory adressing I used a 74HCT00 standard logic, as latch I used a 74HCT573, the uC as said a Dallas 80C320 (also tried Intel 80C32), the Eprom is a 27C256 and as ram I used a 62256[32k]...
But the problem is, it does not run
I have allready inserted the third eprom with the same program and so there is the question, did I something basicly wrong?!?
the error: wenn I power on the board(all parts inserted except the eprom)everything goes right(on both adress and databus is "action"), but when I insert the eprom the upper 8 bits of the adressbus are only rubish(some low, some high but no data).
Until now I built the board two times, but I does not run until today!
Thanks to all who read this text and had fun with by bad english...it would also be ok if you write me, that I mad everythin right 8)
thanks a lot
salamander