Re: [Sdcc-user] pls help me to solve this unusual behaviour

[Ravi K. <ra...@ro...>]

Hi,
There is no external programme memory. And also ALE is not connected.
Any way out!!
Thanks 
Ravi Kumar CH
On Tue, 2003-11-25 at 20:16, Jean-Paul Brodier wrote:
> On 25 Nov 2003 19:41:54 +0530, Ravi Kumar <ra...@ro...> wrote:
> 
> > Hi All,
> > This is my first posting to the list.
> > 	MC:AT89C51
> >         SDCC : mcs51/gbz80/z80/avr/ds390/pic14 2.3.0 (Sep 20 2001)
> > (UNIX)
> > To test 89c51 board, I wrote a test program to generate clock on each
> > port. I have attached the related c file and hex file.
> >
> > My problem:  when  loaded onto 89c51 I dont see any response of LEDs
> > connected to P2. Observing P2 in oscilloscope shows me square waves on
> > each pin of P2 but of different freq.
> 
> Looks like your processor is scanning external addresses on P2 (A8 to 
> A15), looking for an external programme memory.
> 
> Would you mind checking the level of AE\ pin? It should be high if you're 
> using the internal flash ROM.
> 
> > The same program when I write hex code and download onto 89c51 LEDs are
> > blinking and showing same freq, with this obeservation I cannot suspect
> > hardware.
> > I strongly feel I am missing some thing in startup code or compiler
> > options.
> >
> > sdcc -mmcs51 --model-small -c test.c
> > sdcc -mmcs51 --model-small test.rel
> > packihx test.ihx > test.hex
> >
> > Please help me out,
> > Thanks in advance,
> > Ravi Kumar CH
> >
> 
> 
> 
> -- 
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> 
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