Information

When theRESET pin filter or wakeup pin filters are enabled, filter operation begins
immediately. If a low leakage mode is entered within 5 LPO clock cycles of an active
edge, the edge event will be detected by the LLWU. For RESET pin filtering, this means
that there is no restart to the minimum LPO cycle duration as the filtering transitions
from a non-low leakage filter, which is implemented in the RCM, to the LLWU filter.
16.1.2.4 Debug mode
When the chip is in Debug mode and then enters LLS or a VLLSx mode, no debug logic
works in the fully-functional low-leakage mode. Upon an exit from the LLS or VLLSx
mode, the LLWU becomes inactive.
16.1.3 Block diagram
The following figure is the block diagram for the LLWU module.
Chapter 16 Low-Leakage Wakeup Unit (LLWU)
K20 Sub-Family Reference Manual, Rev. 2, Feb 2012
Freescale Semiconductor, Inc. 289