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External Ram on an 18F8722

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pfournier

Joined: 30 Sep 2003
Posts: 89

External Ram on an 18F8722

Posted: Thu Apr 30, 2009 1:13 pm

I have a 18f8722 connected to ram and described in the
Microchip DS39646C-page 102,
FIGURE 7-2: 16-BIT WORD WRITE MODE EXAMPLE.

I also looked at Microchip's AN869, DS00869B
External Memory Interfacing Techniques for the PIC18F8XXX.
FIGURE 4: BASIC EXTERNAL MEMORY CONNECTION DIAGRAM
and
FIGURE 6: WORD WRITE MODE EXAMPLE

I set up like this:

Code:

#fuse EMCU, ABW16, AW16, WAIT

I set MEMCON=0x02

I used:

Code:

write_external_memory command(0x20002, ptr, 2);

Watching the signals using a logic analyzer, the address seems to be wrong in some sort of unpredictable way. Can anyone see something wrong in the setup?
_________________
-Pete

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