Specifications

HARDWARE PREPARATION AND INSTALLATION

2-10 MPC505EVBUM/D

2.2.9 EVB Reset Switches

There are two reset switches on the EVB:

• Switch SW1 lets you reset the MPC505 MCU

• Switch SW2 lets you reset the EVB.

2.2.10 EVB DIP Switches

There are six DIP switches on the EVB (DS1 – DS6):

• DS1 – Attaches the MCU chip selects to the EVB on-board memory and peripheral

devices. You may disable on-board chip selects and connect them via the expansion

connectors (P6 and P8) to external memory or peripheral devices.

• DS2, DS3, DS4, DS5 – Data Bus Reset Configuration Word

• DS6 – On the EVB are 3 RS232 ports (P2, P3, & P4) and one background debug

mode connector (P5). Each of the RS-232 ports can be either DTE or DCE port

(defined by DS6 switches 2, 3 and 4). While the host computer may be connected to

the RS-232 port or the debug mode connector (DS6 switch 1).

HARDWARE PREPARATION AND INSTALLATION

MPC505EVBUM/D 2-7

2.2.4 Keep Alive Power 2 Select Header (J4)

Jumper header J3 provides power to the MCU-internal oscillator, time base, and decementer

modules via the MCU VKAPWR1 pin. You may use either the on-board +3.3 Vdc (jumper on J4

pins 1 and 2) or connect an external +3.3 Vdc power supply to J4 pins 2 and 3. An external +3.3

Vdc power supply on J4 pins 2 and 3 will maintain MCU-internal RAM data after EVB power is

turned OFF. To attach an external power supply to VKAPWR1: remove the jumper on J4 pins 1

and 2, and connect the power supply ground to J4 pin 3 and +3.3 Vdc to pin 2.

CAUTION

Applying power to the EVB with J4 removed and no external

power supply attached to J4 will damage the MPC505 MCU.

Always keep a jumper or an external +3.3 Vdc power supply on J4

pins 1 and 2. If using an external power supply, apply VKAPWR1

before powering up the EVB.

2.2.5 Burst Memory Select Header (J5)

Unused.

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Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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