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ST92141 - INTERRUPTS

3.12 WAKE-UP / INTERRUPT LINES MANAGEMENT UNIT (WUIMU)

3.12.1 Introduction

The Wake-up/Interrupt Management Unit extends

the number of external interrupt lines from 8 to 23

(depending on the number of external interrupt

lines mapped on external pins of the device). It al-

lows the source of the INTD1 external interrupt

channel to be used for up to 16 additional external

Wake-up/interrupt pins.

These 16 WKUP pins can be programmed as ex-

ternal interrupt lines or as wake-up lines, able to

exit the microcontroller from low power mode

(STOP mode) (see Figure 25).

3.12.2 Main Features

Supports up to 16 additional external wake-up

or interrupt lines

Wake-Up lines can be used to wake-up the ST9

from STOP mode.

Programmable selection of wake-up or interrupt

Programmable wake-up trigger edge polarity

All Wake-Up Lines maskable

Note: The number of available pins is device de-

pendent. Refer to the device pinout description.

Figure 25. Wake-Up Lines / Interrupt Management Unit Block Diagram

WUTRH

WUTRL

WUPRH

WUPRL

WUMRH

WUMRL

TRIGGERING LEVEL REGISTERS

PENDING REQUEST REGISTERS

MASK REGISTERS

WKUP[7:0]

WKUP[15:8]

WUCTRL

SW SETTING

TO RCCU - Stop Mode Control

TO CPU

INTD1 - External Interrupt Channel

Note: Reset Signal

on stop bit is

stronger than

the set signal

INT7 (not connected)

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