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SCI Low-Power Mode
1731
SPNU563A–March 2018
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Serial Communication Interface (SCI) Module
30.6 SCI Low-Power Mode
The SCI can be put in either local or global low-power mode. Global low-power mode is asserted by the
system and is not controlled by the SCI. During global low-power mode, all clocks to the SCI are turned off
so the module is completely inactive.
Local low-power mode is asserted by setting the POWERDOWN bit; setting this bit stops the clocks to the
SCI internal logic and the module registers. Setting the POWERDOWN bit causes the SCI to enter local
low-power mode and clearing the POWERDOWN bit causes SCI to exit from local low-power mode. All
the registers are accessible during local power-down mode as any register access enables the clock to
SCI for that particular access alone.
The wake-up interrupt is used to allow the SCI to exit low-power mode automatically when a low level is
detected on the SCIRX pin and also this clears the POWERDOWN bit. If wake-up interrupt is disabled,
then the SCI immediately enters low-power mode whenever it is requested and also any activity on the
SCIRX pin does not cause the SCI to exit low-power mode.
NOTE: Enabling Local Low-Power Mode During Receive and Transmit
If the wake-up interrupt is enabled and low-power mode is requested while the receiver is
receiving data, then the SCI immediately generates a wake-up interrupt to clear the
powerdown bit and prevents the SCI from entering low-power mode and thus completes the
current reception. Otherwise, if the wake-up interrupt is disabled, then the SCI completes the
current reception and then enters the low-power mode.
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