On 4/08/2010 8:19 AM, Jan-Erik Soderholm wrote:
> On 2010-08-03 23:15, David Duffy (AVD) wrote:
>   =20
>> One thing is still not perfectly clear - does the ICSP need to cycle
>> Vcc to program the chip? My limited testing showed that it did not, but
>> is this true for all chip families? David...
>>
>>     =20
> As I understand it, controling Vdd(*) is (only ?) needed when
> re-programming a PIC that has been config'ed with "Internal-MCLR".
> If you do not use that config-option, the programmer usualy do
> not need to cycle/control Vdd since it can get "control" of the
> PIC using the MCLR line only.
>   =20

Ah, that makes sense. I usually use the "Internal-MCLR" option now,=20
either because I use that pin as an input, or so I can tie it low seeing=20
it's next to Vss on most chips I use.

Moving to ICSP with SMD chips means I can probably use large pin count=20
devices to make up for the otherwise lost (to ICSP) pins.
David...

--=20
___________________________________________
David Duffy        Audio Visual Devices P/L
Unit 8, 10 Hook St, Capalaba 4157 Australia
Ph: +61 7 38235717      Fax: +61 7 38234717
Our Web Site: www.audiovisualdevices.com.au
___________________________________________

--=20
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