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C M M - 52259 J U N E 1 1 , 2 0 1 0
U S E R G U I D E
7
POWER
Power to the CMM-52259 is applied at a 2.1mm, center-positive, barrel connect at J8. Input
voltage is limited to the range of +7V to +34V. Insufficient or excessive input voltage may
cause damage the board.
The center tap from the barrel connector is connected to the MISC_PORT, pin 20 (J3-20).
This provides flexibility in embedded applications. The CMM-52259 may be powered through
the J3-20 input or may supply power to external circuitry through this connection.
The CMM-52259 does not apply input transient, over-voltage, or reverse voltage protection at
the input. Care should be used with applying power to the board; otherwise, damage to the
board may occur.
Low-Power Modes
The MCF52259 supports several operating modes designed to reduce power consumption.
Low-power modes include Wait, Doze, Stop, and Halt. Each low-power mode disables differ-
ent MCU sub-systems.
RESET SWITCH
External reset is provided by a RESET push-button switch, or user connection to the RSTI*
signal at the MCU_PORT (J1-5). The MCF52259 provides power-on reset (POR) and low vol-
tage detector (LVD) functions internally. POR holds the device in reset until input voltage rises
and stabilizes at a sufficient level. The LVD is user configurable to force a device reset or in-
terrupt condition if the supply voltage falls below the LVD trip point.
A red LED indicator is connected to the RSTO* output from the target device. If device reset is
asserted, regardless of origin, RSTO* is also asserted causing the RESET LED to turn on.
ABORT SWITCH
The ABORT push-button switch is connected to the target device on IRQ7*/PNQ7. The input
signal may be used as an interrupt input or as a general purpose input/output signal (GPIO).
Interrupt level 7 (IRQ7*) is the highest input level to the MCU. When configured as an interrupt