'PLEASE - HELP ME! PIC17C4X - AGAIN'
Did you run someone external program on PIC17C4X, where's the
executable code is into the a external RAM?
I wrote a program into the external EPROM (address 0x0000) of
PIC17C4X that loads a .bin file from serial, and put it on external RAM.
My program verify the program on RAM is correct with success, but,
when try to execute it, fail!.
I think that then RAM -100 -120ns that i'm using are too slow for
Am i correct?
Try a slower XTAL clock frequency to verify your conclusion !
WF AUTOMACAO wrote:
>PIC17C4X that loads a .bin file from serial, and put it on external RAM.
I hope your program is executing from a different part of memory. The
PIC17 chips can program themselves using the table write commands. You
need to have the external ram at a different address during this operation
for it to work properly.
Otherwise, you may be programming the internal ROM. Just because Vpp is 5v
doesn't mean it won't try to program - it just won't program reliably!
> I think that then RAM -100 -120ns that i'm using are too slow for
Microchip recommends 100nS chips for 20MHz part. If you look at the timing
diagrams, they are 2 clock times wide.
Andy Kunz - Montana Design
Go fast, turn right, and keep the wet side down!
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