Actually with the hardware UART you kinda have to use a level converter
since the polarity of RS232 is the inverse of the TTL that comes out of thge
UART (a '1' in RS232 is a negative voltage while in standard TTL a '1' is a
positive voltage). TTYL


> -----Original Message-----
> From: pic microcontroller discussion list
> [mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Kevin A. Benedict
> Sent: Monday, December 03, 2001 16:23
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Re: [PIC]: No MAX232 needed with PIC16F628 ?
>
>
> Thanks Martin and Wouter,
> you both answered my question :)
> I guess I should have been clearer in asking it.  I wanted to communicate
> with my PC serial port, and I was a little confused on what the usart
> actually did.  I have used bit banged RS232 with the F84 with a MAX232
> and without. So, I probably will use one with the F628, to get true RS232
> levels.
>
> Thanks again,
>              Kevin
>
> >
> >> Hi,
> >>  am I right to assume the PIC16F628 does not need a MAX232 chip, since
> >> it is a hardware usart (RB1(RX)/RB2(TX) ?  I checked the data sheet and
> >searched
> >> the archives, but no luck.
> >>
> >> Thanks in advance,
> >>                   Kevin
> >>
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