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? ? RXD
? ? TXD
Enabled
Enabled
Disabled
Disabled
COM Connector
A standard 9-pin D-sub connector provides external connections for the SCI0 port. The D-sub
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 6: COM Connector
4, 6
TXD
RXD
1, 6
GND
1
2
3
4
5
6
7
8
9
1, 4
RTS
CTS
NC
Female DB9 connector that interfaces to the ColdFire internal SCI1 serial
port via the U2 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 MC52233
Device User Guide available 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 MC52233
Device User Guide available at www.freescale.com for details on using the IIC interface.
Ethernet
The AP52233SLK supports ethernet physical-layer communications through an RJ-45
connector at J2. This interface is compatible with IEEE 802.3 at 10/100 Mbps. This port is
connected 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.
Table 3: Ethernet Port Status LED’s
INDICATOR
COL
DUP
SPD
LNK
COLOR
Red
Green
Green
Green
MCU_SIGNAL
LED_COL
LED_DUP
LED_SPD
LED_LINK
ePHY STATUS
ON – Packet Collision Detected
ON – Full Duplex, OFF – Half Duplex
ON – 100T, OFF – 10T
ON – Link Detected
Freescale Semiconductor
13
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