XR16C854 Datasheet, PDF (12/51 Pages) Exar Corporation – QUAD UART WITH RX/TX FIFO COUNTERS,128-BYTE FIFO

XR16C854
SYMBOL DESCRIPTION
Symbol
Pin
Signal
68 100 64 type
Pin Description
operation.
RX/IRRX A-B 7,29 97,34 62,20
RX/IRRX C-D 41,63 47,85 29,51 I Receive Data Input RX/IRRX A-D. - These inputs are
associated with individual serial channel data to the
XR16C854. Two user selectable interface options are avail-
able. The first option supports the standard modem inter-
face. The second option provides an Infrared decoder
interface, see figures 2/3. When using the standard modem
interface, the RX signal will be a logic 1 during reset, idle (no
data), or when the transmitter is disabled. The inactive state
(no data) for the Infrared decoder interface is a logic 0. MCR
bit-6 selects the standard modem or infrared interface.
During the local loop-back mode, the RX input pin is
disabled and TX data is internally connected to the UART
RX Input, internally.
TX/IRTX A-B 17,19 14,16 8,10
TX/IRTX C-D 51,53 65,67 39,41 O Transmit Data - These outputs are associated with indi-
vidual serial transmit channel data from the 854. Two user
selectable interface options are available. The first user
option supports a standard modem interface. The second
option provides an Infrared encoder interface, see figures 2/
3. When using the standard modem interface, the TX signal
will be a logic 1 during reset, idle (no data), or when the
transmitter is disabled. The inactive state (no data) for the
Infrared encoder/ decoder interface is a Logic 0. MCR bit-
6 selects the standard modem or infrared interface. During
the local loop-back mode, the TX input pin is disabled and
TX data is internally connected to the UART RX Input.
Rev. 1.00P
12