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MC9S12H256 Device User Guide — V01.18

Appendix A Electrical Characteristics

A.1 General

This supplement contains the most accurate electrical information for the MC9S12H256 and

MC9S12H128 microcontroller available at the time of publication.

This introduction is intended to give an overview on several common topics like power supply, current

injection etc.

A.1.1 Parameter Classification

The electrical parameters shown in this supplement are guaranteed by various methods. To give the

customer a better understanding the following classification is used and the parameters are tagged

accordingly in the tables where appropriate.

NOTE:

This classification is shown in the column labeled “C” in the parameter tables

where appropriate.

Those parameters are guaranteed during production testing on each individual device.

Those parameters are achieved by the design characterization by measuring a statistically relevant

sample size across process variations.

Those parameters are achieved by design characterization on a small sample size from typical devices

under typical conditions unless otherwise noted. All values shown in the typical column are within

this category.

Those parameters are derived mainly from simulations.

A.1.2 Power Supply

The MC9S12H256 utilizes several pins to supply power to the I/O ports, A/D converter, oscillator and PLL

as well as the digital core.

The VDDA, VSSA pair supplies the A/D converter and the resistor ladder of the internal voltage regulator.

The VDDX1/VSSX1 and VDDX2/VSSX2 pairs supply the I/O pins except PH, PU, PV and PW. VDDR

supplies the internal voltage regulator.

VDDM1/VSSM1, VDDM2/VSSM2 and VDDM3/VSSM3 pairs supply the ports PH, PU, PV and PW.

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