Rainbow-electronics AT73C246 Manual de usuario descargar pdf (Pagina 25)

11050A–PMAAC–07-Apr-10

AT73C246

11. PMU Functional Description

11.1 Power Manager State Diagram

Figure 11-1. AT73C246 Power Manager Functional State Diagram

AT73C246 is placed in POWERDOWN state at VINSYS rising following the PMU startup state

diagram described in Figure 11-2 on page 26. From this POWERDOWN state, normal CPU sup-

plies startup is achieved through validation of one of the POWER-ON events. From this state,

the PMU may be placed in STANDBY state (e.g.: during CPU sleep periods) upon software

request (STANDBY event). PMU wake-up is achieved if one of the WAKEUP events is detected.

The PMU returns to the POWERDOWN state as soon as a POWER-OFF event is detected. A

special HRST (Hard-Reset) state is provided to ensure complete stop and restart of the CPU

supplies in case of a software crash. Moreover, die temperature and VDD

{0,1,2,3}

supplies are

supervised and may generate a POWER-FAIL event in case of out-of-specification detection.

POWERDOWN

(all supplies OFF)

RSTB = 0

HRST

(all supplies OFF)

RSTB = 0

TWI Reset

STANDBY

(selected supplies ON)

RSTB = 0

RUN

(all supplies ON)

RSTB = 1

POWER-OFF or POWER-FAIL

EVENT

POWER-ON EVENT &

Vin > 3.1V

HRST_POWERDOWN

EVENT

HRST_RUN

EVENT

HRST

EVENT

WAKEUP

EVENT

STANDBY

EVENT

HRST

EVENT

HRST

EVENT

STANDBY-OUT or POWER-FAIL

EVENT

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