Re: Read and Write To External Devices

Ray Bozorg wrote:
> I am using custom design board using 80c400 it is designed with the same
> Memory structure as Tini400 board with exception of using CE3 for additional
> flash memory.
> We also have external component connected to PCE0 the issue is that I can
> easily write to our external devices and the /WR signal on the CPU is
> changing but can not read from them and the /RD signal is not changing
> state.  I have looked at the data sheet and I am missing what I need to do
> can you help or give me a direction.

Ray,

Does PCE0 ever fire?  If not, the memory configuration registers need to 
be modified.  Check the MCON and MCON1 registers for the correct values 
for CE and PCE setup.

-- 
--
Bryan Armstrong
bryan.armstrong-6tN4nzCoH/[email protected]

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