Lpc2000

Thanks, I just found the workaround in the errata.

--- In lpc2000@yahoogroups.com, Richard Duits <yahoo@r...> wrote:
>
> The EXTMODE and EXTPOLAR have some serious bugs for all but the 
latest 
> LPCs. I suggest you look at the errata for the chip you are using.
> 
> Richard Duits.
> 
> 
> bell_c_d wrote:
> 
> > I'm trying to set EXTINT0 to active-high, edge-sensitive (i.e. 
set
> > EXTPOLAR and EXTMODE to 1), but am unable to set/read back bit 0 
in
> > either of the registers.  FWIW, bit 1 (for EXTINT1) sets/reads 
back
> > successfully. 
> >
> > The code sample below looks correct.  Does anyone have any ideas?
> >
> >       byte b=EXTPOLAR;
> >          E3A0320E   mov r3, #0xE0000000
> >          E283397F   add r3, r3, #0x001FC000
> >          E3A02F53   mov r2, #0x0000014C
> >          E7D33002   ldrb r3, [r3, r2]
> >          E54B300D   strb r3, [r11, #-13]
> >       EXTPOLAR = 1; // set EXTINT0 active high
> >          E3A0220E   mov r2, #0xE0000000
> >          E282297F   add r2, r2, #0x001FC000
> >          E3A01F53   mov r1, #0x0000014C
> >          E3A03001   mov r3, #0x00000001
> >          E7C23001   strb r3, [r2, r1]
> >       b=EXTPOLAR;     
> >          E3A0320E   mov r3, #0xE0000000
> >          E283397F   add r3, r3, #0x001FC000
> >          E3A02F53   mov r2, #0x0000014C
> >          E7D33002   ldrb r3, [r3, r2]
> >          E54B300D   strb r3, [r11, #-13]
> >       b=EXTMODE;     
> >          E3A0320E   mov r3, #0xE0000000
> >          E283397F   add r3, r3, #0x001FC000
> >          E3A02F52   mov r2, #0x00000148
> >          E7D33002   ldrb r3, [r3, r2]
> >          E54B300D   strb r3, [r11, #-13]
> >       EXTMODE = 1; // set EXTINT0 edge-sensitive
> >          E3A0220E   mov r2, #0xE0000000
> >          E282297F   add r2, r2, #0x001FC000
> >          E3A01F52   mov r1, #0x00000148
> >          E3A03001   mov r3, #0x00000001
> >          E7C23001   strb r3, [r2, r1]
> >       b=EXTMODE;     
> >          E3A0320E   mov r3, #0xE0000000
> >          E283397F   add r3, r3, #0x001FC000
> >          E3A02F52   mov r2, #0x00000148
> >          E7D33002   ldrb r3, [r3, r2]
> >          E54B300D   strb r3, [r11, #-13]
> >
> >
> >
> >
> >
> >
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