Well....yes it will work without the MAX232 if you are
talking to another TTL device.  Remember, the UART is
doing the job of serializing the data, adding in
start/stop bits, etc such that another device that has
a similar serial device set up in the same manner can
communicate with it.  Granted that to talk to a PC
serial port you will need to use RS232 levels, thus
the MAX232.  All it does is converts the TTL levels to
something else that is more robust than the digital
levels, and can withstand noise that might be induced
on it.  You could use RS422, RS485, or anything else
for that matter, because once you convert it back to
TTL its just serial data again, feeing into the rx
uart and then converted back to 8 bit (typical) data
sitting in a register.



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