Reading Microcontrollers.

Curt @ Atari Museum curt at atarimuseum.com
Fri Mar 4 15:09:14 CST 2011


Thanks for the clarification Chris, as I mentioned I work with Atmel and 
Microchip MCU's, so I wasn't 100% sure on the Motorola unit.



Chris Elmquist wrote:
> On Thursday (03/03/2011 at 10:55PM -0500), Curt @ Atari Museum wrote:
>   
>> It has an SPI (Serial Program Interface) so it should conform to a  
>> standard MOSI/MISO/RESET/SCK interface.... so I you can tap the pinouts  
>> of it, apply gnd and power to it and hook it up to an ISP programmer,  
>> you should be able to read in the code from it and save it as a bin or  
>> hex file.
>>     
>
> well, no. Not exactly.  The SPI on these devices is not used to program or
> in any way access the EPROM on the devices without the 6805 participating
> in such transfers.
>
> They do have a ROM that facilitates programming and dumping of the EPROM
> and it does this through the serial (SCI) port.  However they also have
> a security bit which if set, prevents verifying and dumping the EPROM.
>
> So, you _could_ dump the EPROM, via the serial port, using the on-chip
> ROM code but only if that security bit has not been programmed.
>
>   
>> Here's the datasheet:
>>
>> http://www.ic-on-line.cn/IOL/viewpdf/MC705C8ACFNR2_393498.htm
>>     
>
> section 9.4.8 on page 115 discusses dumping the EPROM...
>
>   
>> Geoffrey Reed wrote:
>>     
>>> I need to pull the rom image off of a MC705C8acpe, anyone know how? Or if it
>>> is possible?
>>>       
>
>   



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