Rainbow-electronics MAXQ613 Manual do Utilizador descarregar pdf (Página 26)

16-Bit Microcontroller with Infrared Module

MAXQ613

26 _____________________________________________________________________________________

Figure 13. Stop Mode Power-Fail Detection with Power-Fail Monitor Disabled

Table 6. Stop Mode Power-Fail Detection States with Power-Fail Monitor Disabled

PFW

RST

POR

STOP

INTERRUPT

INTERNAL RESET

(ACTIVE HIGH)

STATE POWER-FAIL

INTERNAL

REGULATOR

CRYSTAL

OSCILLATOR

SRAM

RETENTION

COMMENTS

A Off Off Off Yes

Application enters stop mode.

> V

RST

CPU in stop mode.

B Off Off Off Yes

< V

PFW

Power-fail not detected because power-fail

monitor is disabled.

C On On On Yes

RST

< V

PFW

An interrupt occurs that causes the CPU to

exit stop mode.

Power-fail monitor is turned on, detects a

power-fail warning, and sets the power-fail

interrupt flag.

Turn on regulator and crystal.

Crystal warmup time, t

XTAL_RDY

On stop mode exit, CPU vectors to the

higher priority of power-fail and the inter-

rupt that causes stop mode exit.

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