MC9S12HZ256 Datasheet, PDF (624/692 Pages) Freescale Semiconductor, Inc – HCS12 Microcontrollers

Appendix A Electrical Characteristics
VDD1, VSS1 and VSS2 are the supply pins for the digital logic, VDDPLL, VSSPLL supply the oscillator
and the PLL.
VSS1 and VSS2 are internally connected by metal.
VDDA, VDDX1, VDDX2, VDDM as well as VSSA, VSSX1, VSSX2 and VSSM are connected by
anti-parallel diodes for ESD protection.
NOTE
In the following context VDD5 is used for either VDDA, VDDM, VDDR
and VDDX1/2; VSS5 is used for either VSSA, VSSR and VSSX unless
otherwise noted.
IDD5 denotes the sum of the currents flowing into the VDDA, VDDX1/2,
VDDM and VDDR pins.
VDD is used for VDD1 and VDDPLL, VSS is used for VSS1, VSS2 and
VSSPLL.
IDD is used for the sum of the currents flowing into VDD1 and VDDPLL.
A.1.3 Pins
There are four groups of functional pins.
A.1.3.1 5V I/O pins
Those I/O pins have a nominal level of 5V. 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. E.g. 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 VRH and VRL pins.
A.1.3.3 Oscillator
The pins XFC, EXTAL, XTAL dedicated to the oscillator have a nominal 2.5V level. They are supplied by
VDDPLL.
A.1.3.4 TEST
This pin is used for production testing only.
MC9S12HZ256 Data Sheet, Rev. 2.04
624
Freescale Semiconductor