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ST92F124/F150/F250 - INTERRUPTS

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

5.12.1 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).

The 16 additional external Wake-up/interrupt pins

can be programmed as external interrupt lines or

as wake-up lines, able to exit the microcontroller

from low power mode (STOP mode) (see Figure

55).

5.12.2 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 55. 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]

NMI

WUCTRL

SW SETTING1)

TO CPU

TO RCCU - Stop Mode Control

TO CPU

INTD1 - External Interrupt Channel

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

Not Connected

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