MC9S12HY64 Datasheet, PDF (718/792 Pages) Freescale Semiconductor, Inc – S12 Microcontrollers

Electrical Characteristics
VDDR supplies the internal voltage regulator.
All VDDM pins are internally connected by metal.
All VSSM pins are internally connected by metal.
VDDA, VDDX, VDDM and VSSA, VSSX, VSSM are connected by diodes for ESD protection.
NOTE
In the following context V_DD35 is used for either VDDA, VDDR, VDDM
and VDDX; V_SS35 is used for either VSSA, VSSM and VSSX unless
otherwise noted.
I_DD35 denotes the sum of the currents flowing into the VDDAand VDDR
pins. The run mode current in VDDM and VDDX is external load dependent
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 4.5V 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 VDDA and VSSA 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.
MC9S12HY/HA-Family Reference Manual, Rev. 1.04
718
Freescale Semiconductor