Справочник Пользователя для Freescale Semiconductor Demonstration Board for Freescale MC9S12XHY256 Microcontroller DEMO9S12XHY256 DEMO9S12XHY256

718

Freescale Semiconductor

The VDDX, VSSX pin pairs [2:1] supply the I/O pins.

The VDDM, VSSM pin pairs [2:1] supply the PU/PV I/O pins.

VDDR supplies the internal voltage regulator.

VDDPLL, VSSPLL pin pair supply the oscillator and the PLL.

VSS1, VSS2 and VSS3 are internally connected by metal.

All VDDX pins are internally connected by metal.

All VSSX pins are internally connected by metal.

VDDA is connected to all VDDX pins by diodes for ESD protection. VDDX must not exceed VDDA by
more than a diode voltage drop. VDDA must not  exceed VDDX by more than a diode drop.

VSSA and VSSX are connected by anti-parallel diodes for ESD protection.

In the following context V

DD35

 is used for either VDDA, VDDR, and

VDDX; V

SS35

 is used for either VSSA and VSSX unless otherwise noted.

I

DD35

 denotes the sum of the currents flowing into the VDDA and VDDR

pins. The Run mode current in the VDDX domain is external load
dependent.

V

DD

 is used for VDD, V

SS

 is used for VSS1, VSS2 and VSS3.

V

DDPLL

is used for VDDPLL, V

SSPLL

 is used for VSSPLL

I

DD

is used for the sum of the currents flowing into VDD, VDDF and

VDDPLL.

There are four groups of functional pins.

The I/O pins have a level in the range of 4.5V to 5.5V. This class of pins is comprised of all port I/O pins,
the analog inputs, BKGD and the RESET pins. Some functionality may be disabled. For example the
BKGD pin pull up is always enabled.

This group is made up by the VDDA/V

RH

 and VSSA/V

RL

 pins.

The pins EXTAL, XTAL dedicated to the oscillator have a nominal 1.8V level. They are supplied by
VDDPLL.