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RESET INDICATOR
The RST_LED is connected to the RSTO* output on the MCF52233. This LED lights when the
MCU is in RESET and remains on for the duration of an asserted RSTO* signal. RSTO* may
also be used as a GP output to drive the RST_LED indicator as needed.
LOW POWER MODES
The MCF52233 supports several operational modes designed to reduce power consumption.
Low-power modes include Wait, Doze, Stop, and Halt. Refer to the MCF52235 documentation
at www.freescale.com for details on configuring and using the various low-power modes.
TIMING
Timing to the AP52233SLK clock module is provided by an external, 25 MHz crystal oscillator.
Refer to the MCF52235 documentation at www.freescale.com for details on use and
configuration.
COMMUNICATIONS
The AP52233SLK board provides 2 SCI ports, 1 QSPI port, and 1 IIC port. RS-232 communication is
supported through a DB9 (COM) connector and through connector J1. QSPI and IIC communications
are supported only through connector J1. The COM_EN option header enables SCI0 functionality
between the MCU and the COM connector.
SCI Port
An RS-232 transceiver provides RS-232 to TTL/CMOS logic level translation between the
COM connector and the MCU. The COM connector is a 9-pin D-sub, right-angle connector. A
ferrite bead on shield ground provides conducted immunity protection. Communication signals
TXD0 and RXD0 are routed from the transceiver to the MCU. These signals are also available
on connector J1. Hardware flow control signals RTS0 and CTS0 are available on connector
J1. RTS has been biased for correct 2-wire operation.
SCI1 signals are available on connector J1 and route directly between the MCU and connector
J1. No RS-232 logic-level translation is provided on SCI1 signals.
COM_EN
The COM_EN option header individually connects and disconnects SCI0 signals between the
MCU and the SCI transceiver. Removing a shunt disconnects the associated signal. Install a
shunt connects the associated signal.
Table 2: COM_EN Option Header
Shunt
ON
OFF
12
? ? CTS
? ? RTS
Enabled
Enabled
Disabled
Disabled
Freescale Semiconductor
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