User's Manual

DFZM-TS2xx
Data Sheet Sheet 14 of 37 AUG 22, 2013
Proprietary Information and Specifications are Subject to Change
PM2: The voltage regulator to the digital core is turned off. Neither the 32MHz XOSC nor the 16MHz RCOSC is
running. Either the 32KHz RCOSC or the 32KHz XOSC is running. PM2 has the second-lowest power
consumption. In PM2, the power-on reset, external interrupts, selected 32KHz oscillator, and Sleep Timer
peripherals are active. I/O pins retain the I/O mode and output value set before entering PM2. All other internal
circuits are powered down. The voltage regulator is also turned off. When PM2 is entered, a power-down
sequence is run.
PM2 is typically entered when using the Sleep Timer as the wakeup event, and also combined with external
interrupts. PM2 should typically be choosen, compared to PM1, when expected sleep time exceeds 3 ms. Using
less sleep time does not reduce system power consumption compared to using PM1.
PM3: The voltage regulator to the digital core is turned off. None of the oscillators is running. PM3 is used to
achieve the operating mode with the lowest power consumption. In PM3, all internal circuits that are powered
from the voltage regulator are turned off (basically all digital modules; the only exceptions are interrupt detection
and POR level sensing).
Reset (POR or external) and external I/O port interrupts are the only functions that operate in this mode. I/O pins
retain the I/O mode and output value set before entering PM3. A reset condition or an enabled external I/O
interrupt event wakes the device up and places it into active mode (an external interrupt starts from where it
entered PM3, whereas a reset returns to start-of-program execution). The content of RAM and registers is
partially preserved in this mode. PM3 uses the same power-down/up sequence as PM2.
PM3 is used to achieve ultralow power consumption when waiting for an external event. It should be used when
expected sleep time exceeds 3 ms.