Asynchronous Serial Ports; Real Time Clock And Nvram; Figure 4-2. Com1 Asynchronous Serial Port Connections (Rj-45) - Motorola MVME5500 Installation And Use Manual

Functional Description

Asynchronous Serial Ports

4

Figure 4-2. COM1 Asynchronous Serial Port Connections (RJ-45)

Real Time Clock and NVRAM

4-10
The MVME5500 board uses two TL16C550C universal asynchronous
receiver/transmitters (UARTs) interfaced to the GT-64260B device bus to
provide the asynchronous serial interfaces. EIA232 drivers and receivers
reside on board. COM1 signals are wired to an RS-232 transceiver that
interfaces to the front-panel RJ-45 connector. COM2 signals are also wired
to a transceiver that interfaces to an on-board 9-pin header (refer to
5, Pin Assignments, for more details). An on-board 1.8432 MHz oscillator
provides the baud rate clock for the UARTs.
DCD#
SIN
SOUT
DTR#
DSR#
NC
RTS#
CTS#
RI#
NC
The SGS-Thomson M48T37V is used by the MVME5500 board to
provide 32KB of non-volatile static RAM, real-time clock, and watchdog
timer. The watchdog timer, if enabled, can be programmed to generate
either an interrupt or system reset if it expires. Refer to the MK48T37V
Data Sheet for programming information.
Chapter
DCD 1
RXD 5
TXD 4
DTR 8
GND 3
6
RTS 2
CTS 7
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