DF69 datasheet(45/106 Pages) PADAUK

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DF69

DC Fan Controller

5-12-3. Wake-up

After entering the Power-Down or Power-Save modes, the DF69 can be resumed to normal operation by

toggling IO pins, Timer16 interrupt is available for Power-Save mode ONLY. Fig. 5-12-2 shows the

differences in wake-up sources between STOPSYS and STOPEXE.

Differences in wake-up sources between STOPSYS and STOPEXE

IO Toggle

T16 Interrupt

STOPSYS

Yes

STOPEXE

Yes

Fig. 5-12-2 Differences in wake-up sources between Power-Save mode and Power-Down mode

When using the IO pins to wake-up the DF69, registers padier and pbdier should be properly set to enable

the wake-up function for every corresponding pin. The wake-up time for normal wake-up is about 1024

ILRC clocks counting from wake-up event; fast wake-up can be selected to reduce the wake-up time by

misc register. For fast wake-up mechanism, the wake-up time is 128 system clocks from IO toggling if

STOPEXE was issued, and 128 system clocks plus oscillator (IHRC or ILRC) stable time from IO toggling if

STOPSYS was issued. The oscillator stable time is the time for IHRC or ILRC oscillator from power-on,

depending on which oscillator is used as system clock source. Please notice that there is no fast wake-up

mode whenever EOSC is enabled.

Suspend

mode

wake-up

mode

system clock

source

wake-up time (tWUP) from IO toggle

STOPEXE

suspend

fast wake-up

IHRC or ILRC

128 * TSYS,

Where TSYS is the time period of system clock

STOPSYS

suspend

fast wake-up

IHRC

128 TSYS + TSIHRC;

Where TSIHRC is the stable time of IHRC from

power-on.

STOPSYS

suspend

fast wake-up

ILRC

128 TSYS + TSILRC;

Where TSILRC is the stable time of ILRC from

power-on.

STOPSYS or

STOPEXE

suspend

fast wake-up

EOSC

1024 * TILRC,

Where TILRC is the clock period of ILRC

STOPEXE

suspend

normal

wake-up

Any one

1024 * TILRC,

Where TILRC is the clock period of ILRC

STOPSYS

suspend

normal

wake-up

Any one

1024 * TILRC,

Where TILRC is the clock period of ILRC

Page 45 of 106

PDK-DS-DF69_V003 – Apr. 18, 2018

DF69 Datasheet(PDF) 45 Page - PADAUK Technology.

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