UM1045 datasheet(14/36 Pages) STMICROELECTRONICS

14 / 36 page

Block descriptions and configurations

EVALSPEAr320HMI

14/36

Doc ID 18410 Rev 3

4.5

RS232 transceivers (U500 and U501)

The board has three RS232 DB9 plug connectors; see also:

●

RS232/UART0 DB9 plug connector (CN500) on page 18

●

RS232/UART2 DB9 plug connector (CN501) on page 18

●

RS232/UART1 DB9 plug connector (CN502) on page 18

Using reduced modem control signals, UART0 can fully utilize the U500 RS232 transceiver;

the RS232_0 signals are available through CN500.

Note:

If the U500 RS232 transceiver is not soldered on the board, RS232_TXD and RS232_RXD

signals can be brought in from the CPU board to the CN500 connector (see Table 8).

UART1 and UART2 have only RX/TX functionality, and are connected to the U501 RS232

transceiver; RS232_1 signals are available from CN502, and RS232_2 signals are available

from CN501.

Table 7.

UART0 RS232 handshake enable configuration

Jumper

Description

Configuration

JP200

UART0_CTS active

UART0_CTS inactive (Default)

The related PL_GPIO38 controls LCD backlight dimming (signal LCD_LEDCTRL)

JP201

UART0_RTS active

UART0_RTS inactive (Default)

The related PL_GPIO37 drives the onboard buzzer

1 2 3

1 23

1 2 3

Table 8.

Bringing UART0/RS232 transceiver signals from the CPU board

Jumper(1)

Description

JP20

Connects the RS232_TXD signal from the CPU board RS232 transceiver to CN500 (UART0)

Default: Not installed

JP21

Connects the RS232_RXD signal from the CPU board RS232 transceiver to CN13 (UART0)

Default: Not installed

Do not install if U10 is soldered to the expansion board.

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