how do i leave this mailing list pls can u tell me as sonn as posible.
thanking u nadeem
-----Original Message-----
From: cwindle@LYCOSMAIL.COM <cwindle@LYCOSMAIL.COM>
To: PICLIST <PICLIST>
Date: Wednesday, June 03, 1998 6:43 PM
Subject: Re: clocking of TMR0


>...Andy, Clyde
>
>Thanks for an explanation, I can't say as I fully understand this though!
>
>>It does.  The single-stepping is accomplished by
>> inserting opcodes into the
>>PIC rather than allowing it to read from the (external)
>>program ROM-emulator.
>
>
>The emulator can't use 2 instructions to execute a single step, else TMR0
would increment by 2.
>
>I tried running the code section below at full speed and did get the
correct value of 246 in W, as Mchip say.
>
>nop                             ; After Instruction contents are
>nop                             ; EMULATOR     SIMULATOR
>nop                             ; T0    W      T0     W
>movlw   245                ;    -    245      -      245
>movwf   TMR0           ; 245   245    245   245
>movfw   TMR0           ; 246   245    245   245
>movfw   TMR0           ; 247   246    245   245
>movfw   TMR0           ; 248   247    246   246
>movfw   TMR0           ; 249   248    247   247
>
>I suppose the rule is just not to trust timer 0 when single stepping with
the emulator. I'm suprised that the microchip simulator (I'm using the
version integrated with MPLAB 3.31) does not give the correct reg contents.
>
>
>Chris.
>
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