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input power source. This power input is decoupled to minimize noise input but is not
regulated. Care should be exercised when using this feature; no protection is applied on this
input and damage to the target board may result if over-driven. Also, do not attempt to power
the target board through this connector while also applying power through the USB-BDM or the
PWR connector; damage to the board may result.
Power may be sourced to off-board circuitry through the J1 connector. The current limitation of
the USB bus or the on-board regulator must be considered when attempting to source power
to external circuitry.
Excessive current drain may damage the target board, the host PC USB hub, or the on-board
regulator. The figure below details the VX_EN option header connections.
VX_EN
ON
Enable power connection to connector J1
?
?
OFF
Disable power connection to connector J1
VX_EN
Figure 5: VX_EN Option Header
CAUTION: Do not apply power to connector J1 while also sourcing power from either the PWR
connector or the USB-BDM circuit. Damage to the board may result.
NOTE: Do not exceed available current supply from the USB-BDM cable or on-board regulator
when sourcing power through connector J1 to external circuitry.
RESET
The MCF52233 can be reset several ways. A logic low applied to the RSTI* input will force the
device into RESET. This input is used by the RESET pushbutton. This input is also used to
force the device in to BDM mode. An internal low-voltage detect forces the part into RESET
when voltage falls too low.
RESET SWITCH
The RESET switch provides a method to apply an asynchronous reset to the MCU and is
connected directly to the RSTI* input on the MCU. Pressing the RESET switch forces RSTI*
input low until the switch is released. An external pull-up on the RSTI* line prevents spurious
resets and allowing normal operation.
LOW VOLTAGE DETECT
The MCF52233 utilizes an internal Low Voltage Detect (LVD) to protect against under-voltage
conditions. The LVD is enabled out of RESET. Consult the MCF52233 Device User Guide for
details on configuring LVD operation.
Freescale Semiconductor
11
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