MM912F634CV2AP datasheet(72/335 Pages) FREESCALE

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Functional Description and Application Information

Wake-up / Cyclic Sense

MM912F634

Freescale Semiconductor

4.8

Wake-up / Cyclic Sense

To wake-up the MM912F634 analog die from Stop or Sleep mode, several wake-up sources are implemented. As described in

Section 4.3, “Modes of Operation", a wake-up from Stop mode will result in an interrupt (D2DINT) to the MCU combined with a

transition to Normal mode. A wake-up from Sleep mode will result in a transition to Reset mode. In any case, the source of the

wake-up can be identified by reading the Wake-up Source Register (WSR). The Wake-up Source Register (WSR) has to be read

after a wake-up condition in order to execute a new STOP mode command. Two base clock cycles (fBASE) delay are required

between the WSR read and MCR write.

In general, there are the following seven main wake-up sources:

•

Wake-up by a state change of one of the Lx inputs

•

Wake-up by a state change of one of the Lx inputs during a cyclic sense

•

Wake-up due to a forced wake-up

•

Wake-up by the LIN module

•

Wake-up by D2D interface (Stop mode only)

•

Wake-up due to internal / external Reset (Stop mode only)

•

Wake-up due to loss of supply voltage (Sleep mode only)

Figure 20. Wake-up Sources

4.8.1

Wake-up Sources

4.8.1.1

Lx - Wake-up (Cyclic Sense Disabled)

Any state digital change on a Wake-up Enabled Lx input will issue a wake-up. In order to select and activate a Wake-up Input

(Lx), the Wake-up Control Register (WCR) must be configured with appropriate LxWE inputs enabled or disabled before entering

low power mode. The Lx - Wake-up may be combined with the Forced Wake-up.

Note: Selecting a Lx Input for wake-up will disable a selected analog input once entering low power mode.

LIN Bus

HS1

HS2

VSUP

LIN

D2DINT

D2DCLK

D2D3

D2D2

D2D1

D2D0

Wake Up

Module

D2D

Wake Up

LIN Wake Up

Lx – Wake Up

Cyclic Sense / Forced

Wake Up Timer

Forced

Wake Up

Cyclic Wake Up

MM912F634CV2AP Datasheet(PDF) 72 Page - Freescale Semiconductor, Inc

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