MC3S12RG128 Datasheet, PDF(508/546 Page) Freescale Semiconductor, Inc – Microcontrollers

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MC3S12RG128 Datasheet, PDF (508/546 Pages) Freescale Semiconductor, Inc – Microcontrollers

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Appendix A Electrical Characteristics

The VDDX, VSSX, VDDR and VSSR pairs supply the I/O pins, VDDR also supplies the internal voltage

regulator.

VDD1, VSS1, VDD2 and VSS2 are the supply pins for the internal logic, VDDPLL, VSSPLL supply the

oscillator and the PLL.

VSS1 and VSS2 are internally connected by metal.

VDDA, VDDX, VDDR as well as VSSA, VSSX, VSSR are connected by anti-parallel diodes for ESD

protection.

NOTE

In the following context VDD35 is used for either VDDA, VDDR and VDDX;

VSS35 is used for either VSSA, VSSR and VSSX unless otherwise noted.

IDD35 denotes the sum of the currents ï¬owing into the VDDA, VDDX and

VDDR pins.

VDD is used for VDD1, VDD2 and VDDPLL, VSS is used for VSS1, VSS2 and

VSSPLL.

IDD is used for the sum of the currents ï¬owing into VDD1 and VDD2.

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 3.15V to 5.5V. 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. It must be tied to VSS.

A.1.3.5 VREGEN

This pin is used to enable the on chip voltage regulator.

MC3S12RG128 Data Sheet, Rev. 1.05

508

Freescale Semiconductor

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