TNETV2501INPGF datasheet(81/197 Pages) TI1

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Functional Overview

December 2002 − Revised November 2008

SPRS206K

3.10.4

Wake-Up Procedures

It is the user’s responsibility to ensure that there exists a valid wake-up procedure before entering idle mode.

Keep in mind that a hardware reset will restore all modules to their active state. All wake-up procedures are

described in the next sections.

3.10.4.1 CPU Domain Wake-up Procedure

The CPU domain can be taken out of idle though an enabled external interrupt or an NMI signal. External

interrupts can be enabled through the use of the IER0 and IER1 registers. Other modules, such as the EMIF

module, will be taken out of idle automatically when the CPU wakes up. Please see the wake-up procedures

for other modules for more information.

3.10.4.2 Master Port Domain (DMA/HPI) Wake-up Procedure

The 5501 DMA module and the HPI module can be taken out of idle simultaneously by executing the following

procedure.

Write ‘0’ to the MPI bit in ICR.

Execute the IDLE instruction.

DMA and HPI wake up.

It is also possible to wake up the DMA and HPI modules individually through the use of the Master Idle Control

Write ‘0’ to the DMA bit or the HPI bit in MICR.

Selected module wakes up.

3.10.4.3 Peripheral Modules Wake-up Procedure

All 5501 peripherals can be taken out of idle simultaneously by executing the following procedure.

Write ‘0’ to the PERI bit in ICR.

Execute the IDLE instruction.

All idled peripherals wake up.

It is also possible to wake up individual peripherals through the use of the Peripheral Idle Control Register by

executing the following procedure.

Write ‘0’ to the idle control bit of peripheral(s) in PICR.

Idled peripherals with ‘0’ in PICR wake up.

TNETV2501INPGF Datasheet(PDF) 81 Page - Texas Instruments