MEC1322 datasheet(194/456 Pages) MICROCHIP

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MEC1322

DS00001719D-page 194

 2014 - 2015 Microchip Technology Inc.

FIGURE 15-2:

INTERRUPT STRUCTURE

15.8.1

WAKE GENERATION

The EC Interrupt Aggregator notifies the Chip Power Management Features to wake the system when it detects a wake

capable event has occurred. This logic requires no clocks.

The interrupt sources AND’ed with the corresponding Enable bit will be OR’ed to produce a wake event

The wake up sources are identified with a “Y” in the “WAKE” column of the Bit definitions table for each IRQ’s Source

15.8.1.1

Configuring Wake Interrupts

All GPIO inputs are wake-capable. In order for a GPIO input to wake the MEC1322 from a sleep state, the Interrupt

Detection field of the GPIO Pin Control Register must be set to Rising Edge Triggered, Falling Edge Triggered, or Either

Edge Triggered. If the Interrupt Detection field is set to any other value, a GPIO input will not trigger a wake interrupt.

Some of the Wake Capable Interrupts are triggered by activity on pins that are shared with a GPIO. These interrupts will

only trigger a wake if the Interrupt Detection field of the corresponding GPIO Pin Control Register is set to Rising Edge

Triggered, Falling Edge Triggered, or Either Edge Triggered.

APPLICATION NOTE:

Neither LPC accesses nor JTAG debug accesses are wake capable. In order to enable LPC

transactions to MEC1322 Logical Devices while the MEC1322 is in a Sleep mode in which

the main oscillator is shut off, just before entering sleep EC firmware must enable an interrupt

on the falling edge of the GPIO associated with the LFRAME# input. When responding to

this LFRAME/GPIO interrupt EC firmware should disable the LFRAME/GPIO interrupt until

firmware determines that it is again appropriate to enter a Deep Sleep mode. Similarly, EC

SOURCE0

ENABLE0

Int source

Int enable

SOURCE1

SOURCEn

ENABLE1

ENABLEn

Interrupt

from block

NVIC

Inputs for

blocks

GIRQx

Block Enable

NVIC

Input for

GIRQx

Bit x

Interrupt

from block

Interrupt

from block

NVIC_EN

result

To Wake

Interface

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