S912XHZ512F1VAG Datasheet, PDF(892/978 Page) Freescale Semiconductor, Inc – Covers MC9S12XHZ384, MC9S12XHZ256

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S912XHZ512F1VAG Datasheet, PDF (892/978 Pages) Freescale Semiconductor, Inc – Covers MC9S12XHZ384, MC9S12XHZ256

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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 ï¬owing 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 ï¬owing into VDD1 and VDDPLL.

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 of 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.1.4 Current Injection

Power supply must maintain regulation within operating VDD5 or VDD range during instantaneous and

operating maximum current conditions. If positive injection current (Vin > VDD5) is greater than IDD5, the

injection current may ï¬ow out of VDD5 and could result in external power supply going out of regulation.

Ensure external VDD5 load will shunt current greater than maximum injection current. This will be the

MC9S12XHZ512 Data Sheet, Rev. 1.06

892

Freescale Semiconductor

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