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SNLS378C – JUNE 1995 – REVISED MAY 2015 PC16550D Universal Asynchronous Receiver/Transmitter With FIFOs
1 Features 3 Description The PC16550D device is an improved version of the
original
16450
Universal
Asynchronous
Receiver/Transmitter (UART). Functionally identical to
the 16450 on powerup (CHARACTER mode: can also
be reset to 16450 Mode under software control) the
PC16550D can be put into an alternate mode (FIFO
mode) to relieve the CPU of excessive software
overhead. 1 Capable of Running All Existing 16450 Software.
Pin for Pin Compatible With the Existing 16450
Except for CSOUT (24) and NC (29). The Former
CSOUT and NC Pins Are TXRDY and RXRDY,
Respectively.
After Reset, All Registers Are Identical to the …
