Hi Tony,


----- Original Message -----
From: Tony Nixon <Tony.Nixon@ENG.MONASH.EDU.AU>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Monday, August 06, 2001 10:24 PM
Subject: Re: [PIC]: Need SPI code for 16F877


| Olin Lathrop wrote:
|
| > Therefore, for most cases, the original code was just fine:
| >
| >     bsf   portb, clock_bit
| >     bcf   portb, clock_bit
|
|
| Probably so, but even Microchip suggest something like....
|
|      bsf   portb, clock_bit
|      nop
|      bcf   portb, clock_bit


And this is proposed also for the general case of a read followed by a write
to the port (i.e with two mov's), letting the logic state to stabilize,
although the quantity of nop's is load(and frequency)-dependent.

To avoid these nop's they suggest a series resistor at the pin.


| --
| Best regards
|
| Tony
|


Best Regards,

S.-

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