Reply by Sutton Mehaffey●February 5, 20092009-02-05
I figured that was what the logic was. I was trying to see if it was
mandatory.
Thanks.
--- In l..., "kittmaster" wrote: >
> --- In l..., "Sutton Mehaffey"
> wrote:
> >
> > The programming board actually provides power to the application at
> > specific times and not at other times???
> >
> >
> >
> > --- In l..., "kittmaster" wrote:
> > >
> > > --- In l..., "Sutton Mehaffey"
> > > wrote:
> > > >
> > > > Anyone done ISP on a 936?
> > > >
> > > > On the app. note AN10258, there is a statement that says 'To
> control
> > > > VDD, a PNP transistor is needed, because P2.3 cannot supply
> enough
> > > > current for the LPC9xx during programming.'
> > > >
> > > > Can I just supply 3.3V all the time to the 936 and not connect
> P2.3
> > > to
> > > > my board? Problems with that?
> > > >
> > > > Sutton
> > > >
> > >
> > >
> > > No, you must build it as stated, it is part of the timing for
> > > entering setup to the device. Build it exactly like the app note
> and
> > > it will work 100%........yes I'm using the 936 and have built a
> > > programmer for both ISP and ICP.
> > >
> >
> I've seen it do that, I guess the logic is that it can do an ISP
> without the system power on. I've seen it light up my target board
> led, program, then disable power....
>
Reply by kittmaster●February 5, 20092009-02-05
--- In l..., "Sutton Mehaffey"
wrote: >
> The programming board actually provides power to the application at
> specific times and not at other times???
>
> --- In l..., "kittmaster" wrote:
> >
> > --- In l..., "Sutton Mehaffey"
> > wrote:
> > >
> > > Anyone done ISP on a 936?
> > >
> > > On the app. note AN10258, there is a statement that says 'To control > > > VDD, a PNP transistor is needed, because P2.3
cannot supply enough > > > current for the LPC9xx during
programming.'
> > >
> > > Can I just supply 3.3V all the time to the 936 and not connect P2.3 > > to
> > > my board? Problems with that?
> > >
> > > Sutton
> > >
> >
> >
> > No, you must build it as stated, it is part of the timing for
> > entering setup to the device. Build it exactly like the app note and > > it will work 100%........yes I'm using the 936
and have built a
> > programmer for both ISP and ICP.
> I've seen it do that, I guess the logic is that it can do an ISP without the system power on. I've seen it light up my target board
led, program, then disable power....
Reply by Sutton Mehaffey●February 5, 20092009-02-05
The programming board actually provides power to the application at
specific times and not at other times???
--- In l..., "kittmaster" wrote: >
> --- In l..., "Sutton Mehaffey"
> wrote:
> >
> > Anyone done ISP on a 936?
> >
> > On the app. note AN10258, there is a statement that says 'To control
> > VDD, a PNP transistor is needed, because P2.3 cannot supply enough
> > current for the LPC9xx during programming.'
> >
> > Can I just supply 3.3V all the time to the 936 and not connect P2.3
> to
> > my board? Problems with that?
> >
> > Sutton
> >
> No, you must build it as stated, it is part of the timing for
> entering setup to the device. Build it exactly like the app note and
> it will work 100%........yes I'm using the 936 and have built a
> programmer for both ISP and ICP.
>
Reply by kittmaster●February 5, 20092009-02-05
--- In l..., "Sutton Mehaffey"
wrote: >
> Anyone done ISP on a 936?
>
> On the app. note AN10258, there is a statement that says 'To control
> VDD, a PNP transistor is needed, because P2.3 cannot supply enough
> current for the LPC9xx during programming.'
>
> Can I just supply 3.3V all the time to the 936 and not connect P2.3 to > my board? Problems with that?
>
> Sutton
> No, you must build it as stated, it is part of the timing for
entering setup to the device. Build it exactly like the app note and
it will work 100%........yes I'm using the 936 and have built a
programmer for both ISP and ICP.
Reply by Sutton Mehaffey●February 5, 20092009-02-05
Anyone done ISP on a 936?
On the app. note AN10258, there is a statement that says 'To control
VDD, a PNP transistor is needed, because P2.3 cannot supply enough
current for the LPC9xx during programming.'
Can I just supply 3.3V all the time to the 936 and not connect P2.3 to
my board? Problems with that?