MC9S12T64 Datasheet, PDF(306/608 Page) Motorola, Inc – Specification

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MC9S12T64 Datasheet, PDF (306/608 Pages) Motorola, Inc – Specification

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Freescale Semiconductor, Inc.

Clocks and Reset Generator (CRG)

Wait Mode

The WAI instruction puts the MCU in a low power consumption stand-by

mode depending on setting of the individual bits in the CLKSEL register.

All individual Wait Mode configuration bits can be superposed. This

provides enhanced granularity in reducing the level of power

consumption during Wait Mode. Table 53 lists the individual

configuration bits and the parts of the MCU that are affected in Wait

Mode.

Table 53 MCU conï¬guration during Wait Mode

PLL

Core

System

RTI

COP

Oscillator

PLLWAI

stopped

-

-

-

-

-

CWAI

-

stopped

-

-

-

-

SYSWAI

-

stopped

stopped

-

-

-

RTIWAI

-

-

-

stopped

-

-

COPWAI

-

-

-

-

stopped

-

ROAWAI

-

-

-

-

-

reduced

After executing the WAI instruction the core requests the CRG to switch

MCU into Wait Mode. The CRG then checks whether the PLLWAI, CWAI

and SYSWAI bits are asserted (see Figure 53). Depending on the

configuration the CRG switches the system and core clocks to OSCCLK

by clearing the PLLSEL bit, disables the PLL, disables the core clocks

and finally disables the remaining system clocks. As soon as all clocks

are switched off Wait Mode is active.

MC9S12T64Revision 1.1.1

306

Clocks and Reset Generator (CRG)

For More Information On This Product,

Go to: www.freescale.com

MOTOROLA

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