ST92141 datasheet(61/179 Pages) STMICROELECTRONICS

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ST92141 - INTERRUPTS

WAKE-UP / INTERRUPT LINES MANAGEMENT UNIT (Cont’d)

WAKE-UP

TRIGGER

HIGH

(WUTRH)

R252 - Read/Write

Reset Value: 0000 0000 (00h)

Bit 7:0 = WUT[15:8]:

Wake-Up Trigger Polarity

Bits

These bits are set and cleared by software.

0: The corresponding WUPx pending bit will be set

on the falling edge of the input wake-up line.

1: The corresponding WUPx pending bit will be set

on the rising edge of the input wake-up line.

WAKE-UP TRIGGER REGISTER LOW (WUTRL)

R253 - Read/Write

Reset Value: 0000 0000 (00h)

Bit 7:0 = WUT[7:0]:

Wake-Up Trigger Polarity Bits

These bits are set and cleared by software.

0: The corresponding WUPx pending bit will be set

on the falling edge of the input wake-up line.

1: The corresponding WUPx pending bit will be set

on the rising edge of the input wake-up line.

WARNING

1. As the external wake-up lines are edge trig-

gered, no glitches must be generated on these

lines.

2. If either a rising or a falling edge on the external

wake-up lines occurs while writing the WUTRH

or WUTRL registers, the pending bit will not be

set.

WAKE-UP PENDING REGISTER HIGH

(WUPRH)

R254 - Read/Write

Reset Value: 0000 0000 (00h)

Bit 7:0 = WUP[15:8]:

Wake-Up Pending Bits

These bits are set by hardware on occurrence of

the trigger event on the corresponding wake-up

line. They must be cleared by software. They can

be set by software to implement a software inter-

rupt.

0: No Wake-up Trigger event occurred

1: Wake-up Trigger event occurred

WAKE-UP PENDING REGISTER LOW (WUPRL)

R255 - Read/Write

Reset Value: 0000 0000 (00h)

Bit 7:0 = WUP[7:0]:

Wake-Up Pending Bits

These bits are set by hardware on occurrence of

the trigger event on the corresponding wake-up

line. They must be cleared by software. They can

be set by software to implement a software inter-

rupt.

0: No Wake-up Trigger event occurred

1: Wake-up Trigger event occurred

Note: To avoid losing a trigger event while clear-

ing the pending bits, it is recommended to use

read-modify-write

instructions

(AND,

BRES,

BAND) to clear them.

WUT15 WUT14 WUT13 WUT12 WUT11 WUT10 WUT9

WUT8

WUT7

WUT6

WUT5

WUT4

WUT3

WUT2

WUT1

WUT0

WUP15 WUP14 WUP13 WUP12 WUP11 WUP10

WUP9

WUP8

WUP7

WUP6

WUP5

WUP4

WUP3

WUP2

WUP1

WUP0

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