S12MSCANV2SLASHD datasheet(29/98 Pages) NXP

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MC9S12KG128 SoC Guide — V01.01

Table 2-2 Power and Ground

NOTE:

All VSS pins must be connected together in the application. Because fast signal

transitions place high, short-duration current demands on the power supply, use

bypass capacitors with high-frequency characteristics and place them as close to

the MCU as possible. Bypass requirements depend on MCU pin load.

2.3 Detailed Signal Descriptions

2.3.1 EXTAL, XTAL — Oscillator Pins

EXTAL and XTAL are the crystal driver and external clock pins. On reset all the device clocks are derived

from the EXTAL input frequency. XTAL is the crystal output.

2.3.2 RESET — External Reset Pin

An active low bidirectional control signal, it acts as an input to initialize the MCU to a known start-up state,

and an output when an internal MCU function causes a reset.

2.3.3 TEST — Test Pin

This input only pin is reserved for test.

NOTE:

The TEST pin must be tied to VSS in all applications.

Mnemonic

Nominal

Voltage

Description

VDD1

VDD2

2.5 V

Internal power and ground generated by internal regulator. These also

allow an external source to supply the core VDD/VSS voltages and

bypass the internal voltage regulator.

VSS1

VSS2

VDDR

3.3/5.0 V

External power and ground, supply to pin drivers and internal voltage

regulator.

VSSR

0 V

VDDX

3.3/5.0 V

External power and ground, supply to pin drivers.

VSSX

0 V

VDDA

3.3/5.0 V

Operating voltage and ground for the analog-to-digital converter and

the reference for the internal voltage regulator, allows the supply

voltage to the A/D to be bypassed independently.

VSSA

0 V

VRH

3.3/5.0 V

Reference voltage high for the ATD converter.

VRL

0 V

Reference voltage low for the ATD converter.

VDDPLL

2.5 V

Provides operating voltage and ground for the Phased-Locked Loop.

This allows the supply voltage to the PLL to be bypassed

independently. Internal power and ground generated by internal

regulator.

VSSPLL

0 V

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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