MAC7200 datasheet(104/976 Pages) FREESCALE

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Low Power Mode Summary

MAC7200 Microcontroller Family Reference Manual, Rev. 2

Freescale Semiconductor

3.7

Low Power Mode Summary

NOTE

In most cases, entering RUN mode is equivalent to exiting a Low Power

Mode, so this is described in Table 3-4.

3.8

Special Notes on Entering and Exiting Power Modes

When entering DOZE mode on the FlexCAN, I2C or SCI, care should be taken to insure that the

corresponding pin-side bus is stopped in a recessive state.

Because the ARM7 core has no DOZE (or similar) instruction, this functionality will be enabled via a

combination of software and hardware (Graceful Stop module). However, there are some “caveats” that

must be paid attention to:

Table 3-3. Low Power Mode Entry Summary

Event

RUN

DOZE

DEBUG

External Reset

Write DOZE register

Set DOZE bit

(on a Peripheral-by-Peripheral basis)

Core enters HALT state

Table 3-4. Low Power Mode Exit Summary

Event

RUN

DOZE

DEBUG

Enter DOZE Mode

Enter DEBUG Mode

Core enters HALT state

Core exits HALT state

External Reset

Crystal Monitor Reset

SWT Reset

SWT Interrupt

SCM Interrupt

Real Time Interrupt (RTI)

Any Enabled, Unmasked Interrupt in the

Interrupt Controller

$00 written to DOZE reg

DOZE bit cleared

(on a Peripheral-by-Peripheral basis)

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