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'picstart+ and in-circuit programming'
1999\04\26@051338 by user-defined?Q?Sebasti=E1n_Dols?=

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Hello all.

I have bought a second hand Picstart+ from a friend, and it will be very
interesting to know if there is a way to use it to program in-circuit
devices (mainly 16f84). picstart is able to program in serial mode the
serial mode programmable devices? if not, exist some kind of adaptor or
circuit (DIY, please, the programmer has drained my budget..) to program
in-circuit from a picstart+?

thanks in advance.

1999\04\26@054526 by Benjamin Petersen

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part 0 27 bytes
Regards
Benjamin Petersen

1999\04\26@115705 by Gerhard Fiedler

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At 11:12 04/26/99 +0200, =?x-user-defined?Q?Sebasti=E1n_Dols?= wrote:
>I have bought a second hand Picstart+ from a friend, and it will be very
>interesting to know if there is a way to use it to program in-circuit
>devices (mainly 16f84). picstart is able to program in serial mode the
>serial mode programmable devices? if not, exist some kind of adaptor or
>circuit (DIY, please, the programmer has drained my budget..) to program
>in-circuit from a picstart+?

i've done that with a self-made adaptor: a DIL-plug, where i connected the
relevant signals to a header. you probably have to make sure that you don't
load them too much in your circuit.

ge

1999\04\26@134947 by Mark Willis

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Gerhard Fiedler wrote:
> <snipped>
> i've done that with a self-made adaptor: a DIL-plug, where i connected the
> relevant signals to a header. you probably have to make sure that you don't
> load them too much in your circuit.
>
> ge

 Just to be quite redundant:  The relevant signals are:
 Pin  4: ~MClr / Vpp
 Pin  5: Vss / Gnd
 Pin 12: RB.6 / Programming Clock
 Pin 13: RB.7 / Programming Data
 Pin 14: Vdd / Vcc

 Mark

1999\04\26@140005 by Windows-1252?Q?Sebasti=E1n_Dols?=

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Ok, so it is possible to extract the signals directly from the socket, and
plug it directly to the circuit. My problem was due to the fact of I didn't
know if a picstart+ programs a 16f84 the same way,  by example,  a ludipipo
or tait does. Now, to be paranoic with the care to my 'new' hardware..what
is the meaning of "don't load them too much in your circuit"?

Gerhard Fiedler wrote:
> <snipped>
> i've done that with a self-made adaptor: a DIL-plug, where i connected the
> relevant signals to a header. you probably have to make sure that you
don't
> load them too much in your circuit.
>
> ge

 Just to be quite redundant:  The relevant signals are:
 Pin  4: ~MClr / Vpp
 Pin  5: Vss / Gnd
 Pin 12: RB.6 / Programming Clock
 Pin 13: RB.7 / Programming Data
 Pin 14: Vdd / Vcc

 Mark

1999\04\26@173200 by Mark Willis

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Sebasti‡n Dols wrote:
>
> Ok, so it is possible to extract the signals directly from the socket, and
> plug it directly to the circuit. My problem was due to the fact of I didn't
> know if a picstart+ programs a 16f84 the same way,  by example,  a ludipipo
> or tait does. Now, to be paranoic with the care to my 'new' hardware..what
> is the meaning of "don't load them too much in your circuit"?
>
> <snipped>

 It means:  Don't draw too much power from the Vss, ~MClr, or the
RB.6/RB.7 lines, or you will not be able to program your F84 as those
lines won't have enough signal strength.

 So long as you have a large enough resistor in series with each I/O
pin, (and not tons of other circuitry off Vss) to off-PIC circuitry,
you're fine - Another way to do this is to use a 10-pin IDC header and
disconnect these 5 lines when programming, then use 5 jumpers across the
header to connect the circuit to the rest of the "real world" when done
programming.

 If you have a R/D/C setup on ~MClr especially, you need to be sure you
leave it free to rise fast enough to let the 'F84 program.

 The Microchip ICSP manuals (.pdf files) give more details.

 Mark

1999\04\26@181939 by Gerhard Fiedler

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At 14:31 04/26/99 -0700, Mark Willis wrote:
>Sebasti‡n Dols wrote:
>>
>> Ok, so it is possible to extract the signals directly from the socket, and
>> plug it directly to the circuit. My problem was due to the fact of I didn't
>> know if a picstart+ programs a 16f84 the same way,  by example,  a ludipipo
>> or tait does. Now, to be paranoic with the care to my 'new' hardware..what
>> is the meaning of "don't load them too much in your circuit"?
>
>  It means:  Don't draw too much power from the Vss, ~MClr, or the
>RB.6/RB.7 lines, or you will not be able to program your F84 as those
>lines won't have enough signal strength.
>
>  So long as you have a large enough resistor in series with each I/O
>pin, (and not tons of other circuitry off Vss) to off-PIC circuitry,
>you're fine - Another way to do this is to use a 10-pin IDC header and
>disconnect these 5 lines when programming, then use 5 jumpers across the
>header to connect the circuit to the rest of the "real world" when done
>programming.

yes, or have the b port pins connected to not active switches or other
high-z outputs (make sure they =are= high-z when you're in programming
mode), or have only vcc and mclr through jumper, or... you have various
options, depending on the application circuit.

i'm not sure, but i think the picstart uses serial programming for all
devices which can be programmed serially.

ge

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