MM912F634CV2AP datasheet(55/335 Pages) FREESCALE

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Functional Description and Application Information

Modes of Operation

MM912F634

Freescale Semiconductor

4.3

Modes of Operation

The MM912F634 analog die offers three main operating modes: Normal (Run), Stop, and Sleep. In Normal mode, the device is

active and is operating under normal application conditions. In Stop mode, the voltage regulator operates with limited current

capability, the external load is expected to be reduced while in Stop mode. In Sleep mode both voltage regulators are turned off

(VDD =VDDX =0V).

Wake-up from Stop mode is indicated by an interrupt signal. Wake-up from Sleep mode will change the MM912F634 analog die

into reset mode while the voltage regulator is turned back on.

The selection of the different modes is controlled by the Mode Control Register (MCR).

Figure 16 describes how transitions are done between the different operating modes.

Figure 16. Modes of Operation and Transitions

4.3.1

Power Down Mode

For the device power (VS1) below VPOR, the MM912F634 analog die is virtually in Power Down mode. Once VS1>VPOR, the

MM912F634 analog die will enter Reset mode with the condition “Power On Reset - POR”.

4.3.2

Reset Mode

The MM912F634 analog die enters Reset mode if a reset condition occurs (POR - Power On Reset, LVR- Low Voltage Reset,

Low Voltage VDDX Reset - LVRX, WDR - Watchdog Reset, EXR - External Reset, and WUR - Wake-up Sleep Reset).

Power

Down

Reset

Normal

Mode

Stop

Mode

Sleep

Mode

Power Up

(POR = 1)

VDD High and Reset

Delay (tRST) expired

Wake Up

External or

Internal Reset

Power Down

(VSUP<VPOR)

WatchDog Time-Out1,

External or Internal Reset

Stop

Command

Sleep

Command

1) Initial WD to be served within tWDTO to enable Window WD

VDD Low and VSUV = 0

and Delay (tVTO) expired

Power Down

(VSUP<VPOR)

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