ZWIR4512 Datasheet

© 2018 Integrated Device Technology, Inc.

16

November 29, 2018

5.4.1 Run Mode

In Run Mode, all functions of the module are available. The microcontroller and all its peripherals are powered. Typically the transceiver is also

powered, but it can be disabled by software. The module enters Run Mode automatically after startup. The application software must switch to

one of the other operating modes if required.

5.4.2 Sleep Mode

In Sleep Mode, the microcontroller core is not clocked. The power state of the transceiver and the microcontroller peripherals depends on the

wakeup configuration. All peripherals that are selected as a wakeup source continue to operate. After wakeup, the application program continues

execution at the position it was stopped. Sleep Mode allows reacting to external events such as the reception of data, external interrupts, or

timer events. The power consumption in this mode strongly depends on which peripherals are enabled. The I/O configuration is not changed

during Sleep Mode.

5.4.3 Stop Mode

Stop Mode is an ultra-low-power mode with RAM retention. The MCU core and the MCU peripherals are not clocked. Only the internal real-

time clock or any external pin can be used for triggering wakeup from Stop Mode. After wakeup, the program continues execution at the position

it was stopped. In Stop Mode, all I/Os remain in the configuration that was active when entering Stop Mode.

5.4.4 Standby Mode

Standby Mode is the lowest power mode. The transceiver and all microcontroller peripherals are consequently powered off. RAM contents are

lost. Waking up from Standby Mode can be triggered by a real-time-timer event or by one dedicated pin. When going to Standby Mode, all I/Os

are put into analog input mode, so the application circuit must ensure that external components receive defined signal levels if required. When

the module exits Standby Mode, it is restarted from the reset handler in the same sequence as the restart after power-on or after the reset

button has been pressed.