Discussion in "General help Guidance and Discussion" started by    sherline123    Mar 6, 2016.
Sun Mar 06 2016, 06:08 pm
#1
Hi. I am new at here. I want to ask is it possible to burn/program EPROM by using 8051? The eprom that i wish to program is EPROM 27128. @@
Mon Mar 07 2016, 08:47 am
#2
It has been years since I programmed eproms.

You will need to get the spec sheet from the maker, as not all 27128s are the same.
Most need a programming voltage of 12 volts or more.
The exact value varies.

You will need to make a programmer to drive the 27128 pins, both address and data.
Also you need to switch reset and Vpp (12v).

But yes , an 8051 could do most of the work.
You need a strong UV light source to erase the eprom.




[ Edited Mon Mar 07 2016, 08:48 am ]
Tue Mar 08 2016, 08:56 am
#3


It has been years since I programmed eproms.

You will need to get the spec sheet from the maker, as not all 27128s are the same.
Most need a programming voltage of 12 volts or more.
The exact value varies.

You will need to make a programmer to drive the 27128 pins, both address and data.
Also you need to switch reset and Vpp (12v).

But yes , an 8051 could do most of the work.
You need a strong UV light source to erase the eprom.



ExperimenterUK


thanks for the reply. sorry i am just a beginner. So i am going to use the eprom as the part of the memory of 8051 or i just use the 8051 GPIO to program it?
Tue Mar 08 2016, 09:26 am
#4


thanks for the reply. sorry i am just a beginner. So i am going to use the eprom as the part of the memory of 8051 or i just use the 8051 GPIO to program it?

sherline123


I'm not sure what you mean.
The 8051 can use EPROMs such as the 27128 as external memory
but read only. (ROM)
To write to an EPROM takes extra hardware, a separate programmer.

One way would be..
Send a byte to the 8051 through the serial port.
Use the ports on the 8051 to set the address and
data pins of the 27128.
Use the remaining 8051 i/o pins to switch E,P and G.

Write the byte, then read it back.
When the byte is programmed,get the next.

Why are you programming a 27128 ?


[ Edited Fri Mar 11 2016, 09:36 am ]

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