MC9S12XD256CAG Datasheet, PDF (1238/1348 Pages) Freescale Semiconductor, Inc – MC9S12XDP512 Data Sheet

Appendix A Electrical Characteristics
NOTE
In the following context V_DD35 is used for either V_DDA, V_DDR, and V_DDX;
V_SS35 is used for either V_SSA, V_SSR and V_SSX unless otherwise noted.
I_DD35 denotes the sum of the currents flowing into the V_DDA, V_DDX and
V_DDR pins.
V_DD is used for V_DD1, V_DD2 and V_DDPLL, V_SS is used for V_SS1, V_SS2 and
V_SSPLL.
I_DD is used for the sum of the currents flowing into V_DD1 and V_DD2.
A.1.3 Pins
There are four groups of functional pins.
A.1.3.1 I/O Pins
Those I/O pins have a nominal level in the range of 3.15 V to 5.5 V. This class of pins is comprised of all
port I/O pins, the analog inputs, BKGD and the RESET pins.The internal structure of all those pins is
identical; however, some of the functionality may be disabled. For example, for the analog inputs the
output drivers, pull-up and pull-down resistors are disabled permanently.
A.1.3.2 Analog Reference
This group is made up by the V_RH and V_RL pins.
A.1.3.3 Oscillator
The pins XFC, EXTAL, XTAL dedicated to the oscillator have a nominal 2.5 V level. They are supplied
by V_DDPLL.
A.1.3.4 TEST
This pin is used for production testing only.
A.1.3.5 VREGEN
This pin is used to enable the on-chip voltage regulator.
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.
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MC9S12XDP512 Data Sheet, Rev. 2.21
Freescale Semiconductor