I am using version 2.02 firmware for the PICkit 1 but I do not
see that VppON and VppOff being commented out. Attached is the 
firmware source code that I have.

Regards,
Xiaofan

Version 2.02 download from Microchip:

;***************************************************************************
***
; EnterProgramMode
;  Issues Enter Program Mode command to PIC12F629/675. Clears ProgramCntr.
;   Inputs:	none
;   Outputs:	none
;***************************************************************************
***
EnterProgramMode
	call	VppInit		; Initiate Vpp PWM
	call	VppOff		; Turn Vpp off
	call	VppHigh		; Set Vpp to 13v (when it's turned on)

	bcf	PORTC,ICSPDATA	; make both clock and data outputs
	bcf	PORTC,ICSPCLOCK
	bsf	STATUS,RP0
	bcf	TRISC,ICSPDATA	; make both clock and data outputs
	bcf	TRISC,ICSPCLOCK
	bcf	STATUS,RP0	


	movlw	0x3F		; force clock and data pin low
	andwf	PORTC,f
	call	Delay2_5ms	; delay
	call	Delay2_5ms 

	clrf	ProgramCntr
	clrf	ProgramCntr+1
	decfsz	ProgramCntr,f	; wait 65536x3 instructions (~160ms)
	goto	$-1
	decfsz	ProgramCntr+1,f
	goto	$-3
	
	call	VppOn		; Turn Vpp on

	decfsz	ProgramCntr,f	; wait 256x3 instructions (~128us)
	goto	$-1		; ProgramCntr is clear upon leaving function
	
	call	VddOn		; turn on Vdd

	decfsz	ProgramCntr,f	; wait 65536x3 instructions (~160ms)
	goto	$-1
	decfsz	ProgramCntr+1,f
	goto	$-3
	return

Version 1.0 from Microchip:

;***************************************************************************
***
; EnterProgramMode
;  Issues Enter Program Mode command to PIC12F629/675. Clears ProgramCntr.
;   Inputs:	none
;   Outputs:	none
;***************************************************************************
***
EnterProgramMode
	bsf	STATUS,RP0
	movlw	0x02		
	movwf	TRISC		; RC1 is input; RC0,RC2-RC7 are outputs
	bcf	STATUS,RP0
	movlw	.85		; Clear ProgramCntr (see later in function)
	movwf	ProgramCntr
	clrf	ProgramCntr+1
	movlw	0x3F		; force clock and data pin low
	andwf	PORTC,f
	call	Delay		; 4 ms delay
	call	Delay 
	call	VppOn		; turn on Vpp
	decfsz	ProgramCntr	; wait 85x3 instructions (~40us)
	goto	$-1		; ProgramCntr is clear upon leaving function
	call	VddOn		; turn on Vdd
	return

-----Original Message-----
From: WH Tan [mailto:tanwh@notes.src.global.sharp.co.jp]
Sent: Monday, July 11, 2005 12:58 PM
To: Microcontroller discussion list - Public.
Subject: RE: [PIC] PICKIT 2 (was PICKit1 & PIC18F2550)


Hi,
Thanks for the scope capture.

I think I can say that my waveform is very much the same as the real PICKit
1. I wonder you must be using the the latest firmware. Since you have looked
into the source. You should notice in v2.0.2, the VppOn, VppHigh etc have
been commented out. In my version I put it back. That was why it has a sharp
rise time to +13V. Also the second pulse should be longer as yours, anyway I
used a breakpoint and it has been came into effect. Also I have raised the
target voltage a bit.

Best regards,
WH Tan
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