MC33742 datasheet(42/52 Pages) MOTOROLA

Part #	MC33742

Description	System Basis Chip (SBC) with Enhanced High-Speed CAN Transceiver

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Manufacturer	MOTOROLA [Motorola, Inc]

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33742

MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA

42

Wake-Up Register (WUR)

Tables 22 through 24 contain various Wake-Up Register

information. Local wake-up inputs L0:L3 can be used in both

Normal and Standby modes as port expander, as well as for

waking up the 33742 from Sleep or Stop modes (Table 22).

Wake-up inputs can be configured by pair. L0 and L1 can be

configured together, and L2 and L3 can be configured together

(Table 23).

——————————————————

Table 22. Wake-Up Register

WUR

R/W

D3

D2

D1

D0

$100b

W

LCTR3

LCTR2

LCTR1

LCTR0

R

L3WU

L2WU

L1WU

L0WU

Reset

Value

–

0

000

Reset

Condition

(Write)

(Note 58)

–

POR, NR2R, N2R, STB2R, STO2R

Notes

58.

See Table 8, page 38, for definitions of reset conditions.

Table 23. Wake-Up Register Control Bits

LCTR3 LCTR2 LCTR1 LCTR0

L0:L1 Config

L2:L3 Config

x

0

Inputs Disabled

–

xx

0

1

High Level

Sensitive

xx

1

0

Low Level

Sensitive

xx

1

Both Level

Sensitive

00

x

–

Inputs Disabled

01

x

High Level

Sensitive

10

x

Low Level

Sensitive

11

x

Both Level

Sensitive

x = Don’t care.

Table 24. Wake-Up Register Status Bits (Note 59)

Name

Value

Description

L3WU

0 or 1

If bit = 1, wake-up occurred from Sleep

or Stop modes; if bit = 0, no wake-up

has occurred.

When device is in Normal or Standby

mode, bit reports the State on Lx

terminal (LOW or HIGH) (0 = Lx LOW,

1= Lx HIGH)

L2WU

0 or 1

L1WU

0 or 1

L0WU

0 or 1

Notes

59.

WUR status bits have two functions. After 33742 wake-up,

they indicate the wake up source; for example, L2WU set at 1

if wake-up source is L2 input. After 33742 wake-up and once

the WUR register has been read, status bits indicate the real-

time state of the Lx inputs (1 = Lx is above threshold, 0 = Lx

input is below threshold). If after a wake-up from Lx input a

watchdog timeout occurs before the first reading of the WUR

register, the LxWU bits are reset. This can occur only if the

33742 was in Stop Mode.

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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