8-bit Microcontrollers中的主题 anything wrong with the EE_WRITE in JL8?

anything wrong with the EE_WRITE in JL8?

tiny — Tue, 10 Jul 2007 12:15:41 GMT

hi all,

I use the ROM resident routine EE_WRITE to emulate e2prom in flash DC00-DC3F, everything is well except that the reset vect(at 0xFFFF) will be changed occationally, though the flash was protected from DC40 to the end. Was there any details about EE_WRITE i dont know caused this?

Re: anything wrong with the EE_WRITE in JL8?

tonyp — Tue, 10 Jul 2007 16:40:54 GMT

You most likely have one of those buggy older versions. Read the relevant errata to know for sure. The suggested workaround is to re-write the routine and run it from RAM. But, that only works if you have enough RAM to spare.

Re: anything wrong with the EE_WRITE in JL8?

bigmac — Tue, 10 Jul 2007 22:46:37 GMT

Hello,

According to AN1831(Rev 3, 11/2005), the JL3 was subject to the "page erasure issue", but not the JL8. But perhaps my information is not up to date.

Regards,

Mac

Re: anything wrong with the EE_WRITE in JL8?

tiny — Fri, 13 Jul 2007 13:06:54 GMT

i think it may be not the problem of erase, because the reset vector was changed not erased.

and its date codes is 0447, not so old.

perhaps it clears the COPCTL while writing flash..............just guess

maybe i should read and disassemble the EE_WRITE code , and then research it.