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ST92F120 - INTERRUPTS

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

5.11.1 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 selected between the INT7 pin

(when available) and 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 41).

5.11.2 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 41. 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]

WKU P[15:8]

NMI

WUCTR L

SW SETT ING1)

TO CPU

TO RCCU - Stop Mode Control

TO CPU

INTD1 - External Interrupt Channel

INT7

Note 1: The reset signal on the Stop bit is stronger than the set signal.

ST92F120 Datasheet(PDF) 86 Page - STMicroelectronics

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