MAC7200 datasheet(101/976 Pages) FREESCALE

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MAC7200 Microcontroller Family Reference Manual, Rev. 2

Freescale Semiconductor

Chapter 3

Low Power Modes

3.1

Low Power Modes Introduction

The MAC72xx provides three low power modes to enable the minimum run current for every application.

The following low power modes are supported (in order of decreasing power consumption).

3.2

Run Mode

This is the “normal” operating mode of the MAC72xx, in which all clocks are running, and all peripherals

are powered up.

Entering Run mode

•Reset

•

Exiting all other current Low Power Modes

In this mode, the following components may be individually controlled:

•

Turn off the RTI by writing 0 to the RTI counter register

•

Turn off the SWT by writing 0 to the SWT counter register

•

Put any peripheral into Disable mode by setting its MDIS bit. Note that after a reset, all peripherals

that support a Disable mode are put into this mode by default.

Exiting Run mode

•

Run mode is exited by entering any other Low Power Mode

3.3

Doze Mode

In this system level mode, the clocks to each peripheral may be disabled in order to reduce power

consumption. This mode is intended for dynamic power management. In Doze mode, each individual

peripheral’s clock is gated by the peripheral itself (See Chapter 5, “System Clock Description” for more

Table 3-1. Low Power Modes

Mode

Description

Run Mode

This is the “normal” operating mode of the MAC72xx, in which all clocks are running, and all peripherals

are powered up.

Doze Mode

In this system level mode, the clocks to each peripheral may be disabled in order to reduce power

consumption. This mode is intended for dynamic power management.

Disabled Mode

In this mode, the peripheral is completely disabled, typically because it is not used for the particular

application being executed. This mode is intended for static power management.

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