Rainbow-electronics MAXQ613 Manual do Utilizador descarregar pdf (Página 24)

16-Bit Microcontroller with Infrared Module

MAXQ613

24 _____________________________________________________________________________________

Table 4. Power-Fail Detection States During Normal Operation

STATE POWER-FAIL

INTERNAL

REGULATOR

CRYSTAL

OSCILLATOR

SRAM

RETENTION

COMMENTS

A On Off Off — V

< V

POR

B On On On —

POR

< V

RST

Crystal warmup time, t

XTAL_RDY

CPU held in reset.

C On On On —

> V

RST

CPU normal operation.

D On On On —

Power drop too short.

Power-fail not detected.

E On On On —

RST

< V

PFW

PFI is set when V

RST

< V

PFW

and

maintains this state for at least t

PFW

, at

which time a power-fail interrupt is gener-

ated (if enabled).

CPU continues normal operation.

(Periodically)

Off Off Yes

POR

< V

RST

Power-fail detected.

CPU goes into reset.

Power-fail monitor turns on periodically.

G On On On —

> V

RST

Crystal warmup time, t

XTAL_RDY

CPU resumes normal operation from 8000h.

(Periodically)

Off Off Yes

POR

< V

RST

Power-fail detected.

CPU goes into reset.

Power-fail monitor turns on periodically.

I Off Off Off —

< V

POR

Device held in reset. No operation allowed.

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