56F800 datasheet(21/56 Pages) FREESCALE

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RS-232 Serial Communications

Technical Summary, Rev. 2

Freescale Semiconductor

2-5

2.4 RS-232 Serial Communications

The 56F827EVM provides an RS-232 interface by the use of an RS-232 level converter, (Maxim

MAX3245EEAI, designated as U3). Refer to the RS-232 schematic diagram in Figure 2-3. The

RS-232 level converter transitions the SCI UART’s +3.3V signal levels to RS-232 compatible

signal levels and connects to the host’s serial port via connector P3. Flow control is not provided,

but could be implemented using uncommitted GPIO signals. The pinout of connector P3 is listed

in Table 2-2. The RS-232 level converter/transceiver can be disabled by placing a jumper at JG2.

56F827

RS-232

Level Converter

Interface

TXDO

RXDO

R1in

T1out

T1in

R1out

FORCEOFF

JG2

+3.3V

Jumper Removed:

Enable RS-232

Jumper Pin 1-2:

Disable RS-232

Figure 2-3. Schematic Diagram of the RS-232 Interface

Table 2-2. RS-232 Serial Connector Description

Pin #

Signal

Pin #

Signal

Jumper to 6 & 4

Jumper to 1 & 4

TXD

Jumper to 8

RXD

Jumper to 7

Jumper to 1 & 6

N/C

5GND

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