PC912XDP512F0MPVR datasheet(1238/1348 Pages) FREESCALE

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Appendix A Electrical Characteristics

MC9S12XDP512 Data Sheet, Rev. 2.21

1240

Freescale Semiconductor

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 ﬂowing 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 ﬂowing 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 3.15 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 VRH and VRL 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 VDDPLL.

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 VDD35 or VDD range during instantaneous and

operating maximum current conditions. If positive injection current (Vin > VDD35) is greater than IDD35,

the injection current may ﬂow out of VDD35 and could result in external power supply going out of

regulation. Ensure external VDD35 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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