RXD0, TXD0 BAUD0, RXD1, TXD1, BAUD1 (obsolete)

Earlier hardware versions had only 1 or 2 UARTs.  Now there can be up to 8 in some parts, so these dedicated routines were replaced by RXD(channel) , TXD(channel) and BAUD(channel)

If you need to support earlier code use the pre-processor

#define RXD0  RXD(0)
#define TXD0  TXD(0)
#define BAUD0  BAUD(0)

#define RXD1  RXD(1)
#define TXD1  TXD(1)
#define BAUD1  BAUD(1)\