actually, the voltage rises during programming from about 5v to 9.4v so i
dont know, i wonder is there some way i can add voltage here?

------------------------------------------------------------------------------
A member of the PI-100 Club:
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058209749445923078164062862089986280348253421170679

On Thu, 10 Sep 1998, Russell McMahon wrote:

> I believe that the correct programming voltage (Vihh) on MCLR is
> meant to be nominally +12 volts.
>
> I could not find the actual specified value anywhere in the 16F84
> data sheet.
> In AN589 microchp themselves use 13.5 volt. This is for a 16C84 but I
> believe the voltage is the same for each. AN656 uses 13 volts.
>
> Your reported 9.4 volts sounds MUCH too low - is this due to a low
> supply voltage or does the voltage at MCLR drop to this level during
> programming? - if so you may wish to look at other causes.
>
>
> -----Original Message-----
> From: Lynx {Glenn Jones} <jones_gl@EFN.ORG>
> To: PICLIST@MITVMA.MIT.EDU <PICLIST@MITVMA.MIT.EDU>
> Date: Thursday, September 10, 1998 6:30 PM
> Subject: PIC-Programmer 2 not working
>
>
> >Has anyone built the serial pic programmer at
> >http://www.gbar.dtu.dk/~c888600/newpics.htm   ?
> >I just finished, and despite checking, rechecking and other efforts,
> it
> >wont work. I measure 5.25 Volts across Vss and Vdd and 9.4 Volts
> across
> >MCLR and Vss. is this not enough? also, Ive tried several softwares
> >including the one that is on the site to no avail. it seems unable
> to read
> >or write, when i try reading with a PIC in, i get a bunch of 3FFF's
> and i
> >get exactly the same without the PIC. Im using a PIC16F84. I have
> tried
> >two different chips with no success. any ideas?
> >
> >
> >--------------------------------------------------------------------
> ----------
> >A member of the PI-100 Club:
> >3.1415926535897932384626433832795028841971693993751
> >058209749445923078164062862089986280348253421170679
> >
>