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'[PIC]: No MAX232 needed with PIC16F628 ?'
2001\12\03@155241 by kben

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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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2001\12\03@161115 by Martin Peach

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Depends: the MAX232 converts the UART I/O to RS-232 levels (inverted +-12V).
If you are communicating with an RS-232 device you probably need it. You
could equally communicate via RS-485, RS-422, MIDI, or whatever uses a
serial protocol using the same USART but you will need different hardware to
transform the signals to/from TTL levels.
/\/\/\/*=Martin

{Original Message removed}

2001\12\03@163231 by kben

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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

{Quote hidden}

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2001\12\03@174955 by Herbert Graf

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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 removed}

2001\12\03@190758 by Jay Hanson

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>So, I probably will use one with the F628, to get true RS232 levels.

I like the F628, but you still need the MAX232 interface chip in order to
get RS232 voltages.

Jay

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