STR720 datasheet(70/401 Pages) STMICROELECTRONICS

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STR720 - WAKE-UP INTERRUPT UNIT (WIU)

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8 WAKE-UP INTERRUPT UNIT (WIU)

8.1 Introduction

The Wake-up/Interrupt Management Unit supports up of 16 external wake-up/interrupt lines.

These 16 Wake-up pins (usually alternate function of general purpose I/O lines) can be

programmed as external interrupt lines or as wake-up lines, capable of restoring the normal

operations from those low power modes where system clocks is stopped.

In STR720 implementation, the 16 interrupt lines are associated to the different IRQ channels

in the following way:

■

4 external wake-up lines all connected to the IRQ0 channel of the interrupt controller. These

wake-up lines have dedicated input ports.

■

1 external wake-up line directly mapped to a dedicated channel of the interrupt controller

(IRQ1). This wake-up line has a dedicated input port.

■

10 internal wake-up lines also connected to the IRQ2 channel of the interrupt controller

module. The ‘internal” lines are mapped on some significant STR720 signals.

The mapping of wake-up/interrupt events on available WIU lines can be found in Section 5.2:

Wake-up/Interrupt management Unit (WIU) on page 34, where also possible limitation of

usage can be found.

For each wake-up/interrupt line a pending bit is available, so a 16-bit register contains the

interrupt pending bits of the 16 external lines (WUPR).

Interrupt pending bits are set by hardware or software on occurrence of the trigger event and

are reset by software.

A 16-bit register (WUMR) is used to mask the interrupt or wake-up requests coming from the

16 wake-up/interrupt lines: resetting the bits of this mask register prevents the interrupt or

wake-up requests, generated on the corresponding lines.

In order to give more flexibility to the user for the application, a 16-bit register (WUTR) allows

to program the triggering on rising or falling edge of the external wake-up pins.

8.2 Main Features

•

Supports 16 external wake-up or interrupt lines.

•

Wake-Up lines can be used to wake-up the system from stopped clock conditions.

•

Programmable selection of wake-up or interrupt.

•

Programmable wake-up/interrupt trigger edge polarity.

•

All Wake-Up Lines maskable.

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