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are you sure that the H8/300 series is even capable of supporting external memory in such that it can directly address it from the CPU core?
One of the basic no-nos, I guess.
Quote from: pcprogrammer on July 11, 2024, 05:57:50 amare you sure that the H8/300 series is even capable of supporting external memory in such that it can directly address it from the CPU core?You got it wrong. I want to directly address internal flash memory, not the opposite. It's vaguely described in hardware manuals as "Programmer mode".
You should have worded your question more clear then. See chapter 19 in the manual found here: https://www.farnell.com/datasheets/1500333.pdfIt shows an adapter for the H8/3048F, but might be the same as what you already found and suited for the one you are searching for.
So you want to read its program?One of the basic no-nos, I guess.
What the device on this "tiny" chip, alarm-clock? Electric kettle?
I see "BCD"-format inside - I seem alarm-clock. You can try manually check pins for CE and OE, but I recommend FPGA instead because need calculations for address and data lines.
....But those are hard to get and/or too expensive to just throw them into the bin :\ I have only single sample and I can't damage it.
You need to buy spare chips for testing first. They are cheap like a dog soap.https://aliexpress.com/item/1005006994759425.htmlApprox. 10 times cheaper than SH7047.
.... how did you find it? ....
This mcu has 96KB of memory because the bootrom takes up exactly 32. It is most likely exactly the same as the SH7047. You can search for holes in it according to your hobby, I have attached the file.
... obviously the bootloader can't be the same. ....
It most likely contain the same C-code compiled differently. Because size is matched.
I doubt that. ....
Okay. I repeat - see datasheet for SH7047 and compare. And write your advice after.
I've looked on datasheet and there are some similarities for sure...
Pages about flash of your mcu looks like a copy from SH7047. What's not clear?