The SPLat chip comes pre-loaded with slightly modified CC18 firmware. The “slight modification” consists of one added pin that can can control the direction of an RS485 transceiver chip, so you can very easily build boards that will operate Xwire over long distances via RS485.
The chip provides 16 DI, 16 DO (in the CC18 board they are connected together to give 16BIO), 2 analog in, programming UART, Xwire UART with RS485 direction control pin, and drive for a bicolour status LED. CC18 schematic
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