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MPC821 Datasheet(PDF) 183 Page - NXP Semiconductors

Part # MPC821
Description  Design Specification
PDF  242 Pages
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Manufacturer  NXP [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo NXP - NXP Semiconductors

MPC821 Datasheet(HTML) 183 Page - NXP Semiconductors

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Hardware Preparation and Installation
MOTOROLA
MPC860TFADS Daughter Board Design Specification—Rev 0.1
7
PRELIMINARY—SUBJECT TO CHANGE WITHOUT NOTICE
FIGURE 2-3 Power-On Reset Source Selection
2•3•3
VDDL Source Selection
J3 serves as a selector for VDDL - MPC internal logic supply. When a jumper is placed between po-
sitions 1 - 2 of J3, VDDL is supplied with 3.3V. When a jumper is placed between positions 2 - 3 of
J3, VDDL is supplied by 2V power source. The jumper on J3 is factory set between positions 1 - 2 to
supply 3.3 to VDDL.
FIGURE 2-4 VDDL Source Selection
2•3•4
Keep Alive Power Source Selection
J2 selects the Keep Alive power source of the MPC. When a jumper is placed between positions 1 -
2 of J2, the Keep Alive power is fed from the main 3.3V bus. When an external power sourceA is to
be connected to the Keep Alive power rail, it should be connected between positions 2 (the positive
pole) and position 3 (GND) of J2.
A. E.g., a battery.
1
1
J1
J1
KA Power Rail
MAIN Power Rail
1
1
VDDL - 3.3V
VDDL - 2V
J3
J3
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com



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