PFS172 datasheet(55/92 Pages) PADAUK

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PFS172

8bit MTP MCU with 8-bit ADC

Page 55 of 92

PDK-DS-PFS172-EN_V000-May 8, 2020

5.10.3

Wake-up

After entering the Power-Down or Power-Save modes, the PFS172 can be resumed to normal

operation by toggling IO pins, Wake-up from timer are available for Power-Save mode ONLY. Table 5

shows the differences in wake-up sources between STOPSYS and STOPEXE.

Differences in wake-up sources between STOPSYS and STOPEXE

IO Toggle

Timer wake-up

STOPSYS

Yes

STOPEXE

Yes

Table 5: Differences in wake-up sources between Power-Save mode and Power-Down mode

When using the IO pins to wake-up the PFS172, registers pxdier should be properly set to enable the

wake-up function for every corresponding pin. The time for normal wake-up is about 3000 ILRC clocks

counting from wake-up event; fast wake-up can be selected to reduce the wake-up time by misc register,

and the time for fast wake-up is about 45 ILRC clocks from IO toggling.

Suspend mode

Wake-up mode

Wake-up time (tWUP) from IO toggle

STOPEXE suspend

STOPSYS suspend

Fast wake-up

45 * TILRC,

Where TILRC is the time period of ILRC

STOPEXE suspend

STOPSYS suspend

Normal wake-up

3000 * TILRC,

Where TILRC is the clock period of ILRC

Please notice that when Fast boot-up is selected, no matter which wake-up mode is selected in misc.5,

the wake-up mode will be forced to be FAST. If Normal boot-up is selected, the wake-up mode is

determined by misc.5.

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