Nano SocketLAN connection to PIC

[LGabrielson]

Well, no, I'm not SURE, but I think so. For example, on the SocketLAN demo board the serial data just comes out of the LAN module, and goes through a MAX232 inverter/level shifter and out to the PC serial connection. The hardware uart on the PIC assumes that you're going through a similar driver IC (I think)... and if you're staying in the TTL world, that would mean an inverter only. I should get my SocketLAN today, so will just wait and set it up on the bench. At least I've decided to use the hardware serial port and the interrupt question has been answered. I'm just going to lay out a small motherboard for the SocketLAN. We'll just answer the inverter question today or tomorrow.

[dhouston]

When connecting to a PC it is necessary to both invert the logic and convert the voltage levels but when connecting to an embedded TTL device, there's no need for either as it outputs TTL levels with positive logic. You will need level conversion if your microcontroller is powered by +5V but that's far simpler than a MAX232.

[LGabrielson]

OK! The voice of authority! As long as the polarity of the PIC's hardware uart is right for the SocketLAN, life is good. I DO need level conversion from 5V to 3.3V and will use the SN74LVC2G07 with a pullup to the appropriate power supply on the outputs. Thanks to both of you.