M 5 2 2 3 3 D E M O
S E P T E M B E R 2 5 , 2 0 0 6
15
Table 4: COM_EN Option Header
Shunt
On
Off
CTS
▪
▪
Enabled
Disabled
RTS
▪
▪
Enabled
Disabled
RXD
▪
▪
Enabled
Disabled
TXD
▪
▪
Enabled
Disabled
COM Connector
A standard 9-pin Dsub connector provides external connections for the SCI0 port. The Dsub
shell is connected to board ground through a ferrite bead. The ferrite bead provides noise
isolation on the RS-232 connection. The DB9 connector pin-out is shown below.
Figure 7: COM Connector
4, 6
1
6
1, 4
TXD
2
7
RTS
RXD
3
8
CTS
1, 6
4
9
NC
GND
5
Female DB9 connector that interfaces to the ColdFire internal SCI1 serial
port via the RS232 transceiver.
Pins 1, 4, and 6 are connected together.
SPI Port
SPI signaling connects directly between connector J1 and the MCU. Refer to the MCF52235
documentation at
www.freescale.com
for details on using the SPI interface.
IIC Port
IIC signaling connects directly between connector J1 and the MCU. Refer to the MCF52235
documentation at
www.freescale.com
for details on using the IIC interface.
ETHERNET
The M52233DEMO supports ethernet physical-layer communications through an RJ-45 con-
nector at J2. This interface is compatible with IEEE 802.3 at 10/100 Mbps. This port is con-
nected to the Ethernet Physical Layer Transceiver (ePHY) and Fast Ethernet Controller (FEC)
internal to the MCU. The coupling transformer T1 provides port isolation. Refer to the
MCF52235 documentation at
www.freescale.com
for further details on operation of the ePHY
and FEC. Five LED’s provide ethernet port status. These active-low status LED’s are driven
directly by the MCU.
