MC9S12NE64CPVE Datasheet, PDF (503/554 Pages) Freescale Semiconductor, Inc – MC9S12NE64 Device Overview

Current Injection
A.3.3 Oscillator
The pins XFC, EXTAL, XTAL dedicated to the oscillator have a nominal 2.5 V level. They are
supplied by V_DDPLL.
A.3.4 TEST
This pin is used for production testing only, and should be tied to ground during normal operation.
A.4 Current Injection
Power supply must maintain regulation within operating V_DD3 or V_DD range during instantaneous
and operating maximum current conditions. If positive injection current (V_in > V_DD3) is greater
than I_DD3, the injection current may flow out of V_DD3 and could result in external power supply
going out of regulation. Ensure external V_DD3 load will shunt current greater than maximum
injection current. This will be the greatest risk when the MCU is not consuming power; e.g., if no
system clock is present, or if clock rate is very low, which would reduce overall power
consumption.
A.5 Absolute Maximum Ratings
Absolute maximum ratings are stress ratings only. A functional operation under or outside those
maxima is not guaranteed. Stress beyond those limits may affect the reliability or cause permanent
damage of the device.
This device contains circuitry protecting against damage due to high static voltage or electrical
fields; however, it is advised that normal precautions be taken to avoid application of any voltages
higher than maximum-rated voltages to this high-impedance circuit. Reliability of operation is
enhanced if unused inputs are tied to an appropriate logic voltage level (e.g., either V_SS3 or V_DD3).
MC9S12NE64 Data Sheet, Rev. 1.1
Freescale Semiconductor
503