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3.11.4

Wake-Up Procedure

TMS320VC5502

Fixed-Point Digital Signal Processor

SPRS166J – APRIL 2001 – REVISED AUGUST 2006

Table 3-25. Peripheral Behavior at Entering IDLE State (continued)

MODULE BEHAVIOR AT ENTERING IDLE STATE

CLOCK DOMAIN

MODULES

(ASSUMING THE IDLE CONTROL IS SET)

PLL divider

Enter IDLE state immediately.

Clock Generator

PLL core

Power-down state if set by software before IDLE

Oscillator

Power-down state if set by software before IDLE

Enter IDLE mode after current DMA transfer or enter IDLE mode

EMIF

immediately if no activity exists.

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.

3.11.4.1 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.

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

The 5502 DMA module and the HPI module can be taken out of idle simultaneously by executing the

following procedure.

1. Write '0' to the MPI bit in ICR.

2. Execute the IDLE instruction.

3. 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 Register. To wake up only the DMA or the HPI module, perform the following steps:

1. Write '0' to the DMA bit or the HPI bit in MICR.

2. Selected module wakes up.

3.11.4.3 Peripheral Modules Wake-up Procedure

All 5502 peripherals can be taken out of idle simultaneously by executing the following procedure.

1. Write '0' to the PERI bit in ICR.

2. Execute the IDLE instruction.

3. 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.

1. Write '0' to the idle control bit of peripheral(s) in PICR.

2. Idled peripherals with '0' in PICR wake up.

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