Start-up code for 89c51 Re: [Sdcc-user] pls help me to solve this unusual behaviour

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

Hi all,
Could any pls tell me what options to set for 
Atmel AT89C51 using built in data memory and program memory with no
external memory.
And start-up code for the same.
Thanks in advance,
Regards,
Ravi Kumar CH
On Thu, 2003-11-27 at 09:42, Ravi Kumar wrote:
> 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
> > >
> > 
> > 
> > 
> > -- 
> > NEVER jump into a LOOP!
> > 
> > 
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