MC9S12P128 Datasheet, PDF (500/564 Pages) Freescale Semiconductor, Inc – S12 Microcontrollers

Electrical Characteristics
NOTE
In the following context V_DD35 is used for either VDDA, VDDR, and
VDDX; V_SS35 is used for either VSSA and VSSX unless otherwise noted.
I_DD35 denotes the sum of the currents flowing into the VDDA, VDDX and
VDDR pins.
A.1.3 Pins
There are four groups of functional pins.
A.1.3.1 I/O Pins
The I/O pins have a level in the range of 3.15V to 5.5V. This class of pins is comprised of all port I/O pins,
the analog inputs, BKGD and the RESET pins. Some functionality may be disabled.
A.1.3.2 Analog Reference
This group is made up by the VRH and VRL pins.
A.1.3.3 Oscillator
The pins EXTAL, XTAL dedicated to the oscillator have a nominal 1.8V level.
A.1.3.4 TEST
This pin is used for production testing only. The TEST pin must be tied to ground in all applications.
A.1.4 Current Injection
Power supply must maintain regulation within operating V_DD35 or V_DD range during instantaneous and
operating maximum current conditions. If positive injection current (V_in > V_DD35) is greater than I_DD35,
the injection current may flow out of V_DD35 and could result in external power supply going out of
regulation. Ensure external V_DD35 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.1.5 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_SS35 or V_DD35).
S12P-Family Reference Manual, Rev. 1.12
500
Freescale Semiconductor