MAC7200 datasheet(103/976 Pages) FREESCALE

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System Wakeup

MAC7200 Microcontroller Family Reference Manual, Rev. 2

Freescale Semiconductor

•

Core clears the MDIS bit in the peripheral

3.5

System Wakeup

Because the interrupt controller has a combinatorial bypass signal, that is active even during low power

modes, all interrupt sources in the system will serve as wakeup signals, with a flexible priority masking

scheme (i.e.-only interrupts above a certain priority will wake the system).

This gives us the following sources to wake up the system:

The general flow to setup a wakeup is as follows:

1. Set the ENBWCR bit in the MWCR register in the MCM

2. Set the PRILVL[3:0] bits in the MWCR register in the MCM

3. Clear any pending interrupts in the peripheral(s) that will be used to generate wakeup interrupts

4. Set the appropriate level in the ICR register in the interrupt controller corresponding to the interrupt

source(s) that will be used for wakeup

5. Write the IMRL and/or IMRH registers in the interrupt controller to enable all interrupts that will

be used for wakeup

6. Setup the interrupt(s) in the peripheral(s) that will be used to generate wakeup interrupts.

Generally, this involves setting an interrupt enable and clearing an interrupt mask

Once the system has woken up, the general flow to identify the source of the wakeup is as follows:

1. Read the IPRH and IPRL registers in the interrupt controller to determine which (if any) interrupt

wakeup sources are pending

2. Once the wakeup sources have been identified, clear all sources

3.6

Low Power Mode Differences from MAC71xx

•

STOP mode is not supported

•

Wakeup from DOZE is only on interrupts now

— Wakeup from VREG API is removed

— Wakeup from PIM Keypad Wake-Up (KWU) is removed. Wakeup from an external source can

still be done using the normal interrupt functionality of the PIM.

Table 3-2. Wakeup Sources

Where to

enable

Pending Status

in INTC ?

Where to

clear

Interrupt

Peripheral

INTC

MCM (MWCR reg)

Yes

Peripheral

INTC

MAC7200 Datasheet(PDF) 103 Page - Freescale Semiconductor, Inc

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