Hi!

This is my first attempt at using an 8051, but so far it's not so bad.

What _is_ bad is trying to get information out of wiznet. The W7100 is an 8051(8052?) chip with a builtin hardware TCP/IP stack.

It has 32k code flash, 32k XRAM, and 256 bytes of builtin data flash. I have not, however, succeeded at accessing the data flash.

Wiznet has just released some sample code for accessing the data flash, but it seems like a dirty hack. They are calling into the ISP functions
for reading/writing the data stack, which plays bad tricks on the memory, since it maps the boot/isp code back over the code space, ugh.

What I'm getting at is this: Can anyone guess at what assembler instructions might be used for accessing this data flash?

What I'd _REALLY_ like to know is where wiznet got their 8051 core, so I could find documentation for it. So far, their documentation
is not very thorough.

A few features that might make it easier to identify:
It has DPTR and DPTR1. There's a "TSL" bit called "Toggle Select Enable", and "SEL" to select which one is actually DPTR.
The documentation seems to indicate that DPTR / DPTR1 are incremented or decremented on access, depending on the top two bits of a certain config register,
but that doesn't actually appear to happen. The SEL bit does get toggled though, so a copy loop looks like this:

movx A, @DPTR
movx @DPTR, A
inc DPTR
inc DPTR

Any suggestions or feedback are greatly appreciated.

More info on this chip is available at wiznet.co.kr and wizwiki.net.

--buddy