TL16C554
D7-D0
A2-A0
_ CSx
IOR, IOW RESET
__INTx
TXRDY, RXRDY
XTAL1
XTAL2
RXx
TXx
CTSx
RTSx
DSRx
DTRx
Rlx
DCDx
t For TL16C550 circuitry; refer to the TL I6C550B data sheet.