Information
Section Number Title Page
15.3.3 Low-voltage warning (LVW) interrupt operation.......................................................................................280
15.4 I/O retention..................................................................................................................................................................281
15.5 Memory map and register descriptions.........................................................................................................................281
15.5.1 Low Voltage Detect Status And Control 1 register (PMC_LVDSC1)........................................................281
15.5.2 Low Voltage Detect Status And Control 2 register (PMC_LVDSC2)........................................................283
15.5.3 Regulator Status And Control register (PMC_REGSC)..............................................................................284
Chapter 16
Low-Leakage Wakeup Unit (LLWU)
16.1 Introduction...................................................................................................................................................................287
16.1.1 Features........................................................................................................................................................287
16.1.2 Modes of operation......................................................................................................................................288
16.1.3 Block diagram..............................................................................................................................................289
16.2 LLWU signal descriptions............................................................................................................................................290
16.3 Memory map/register definition...................................................................................................................................291
16.3.1 LLWU Pin Enable 1 register (LLWU_PE1)................................................................................................292
16.3.2 LLWU Pin Enable 2 register (LLWU_PE2)................................................................................................293
16.3.3 LLWU Pin Enable 3 register (LLWU_PE3)................................................................................................294
16.3.4 LLWU Pin Enable 4 register (LLWU_PE4)................................................................................................295
16.3.5 LLWU Module Enable register (LLWU_ME)............................................................................................296
16.3.6 LLWU Flag 1 register (LLWU_F1).............................................................................................................298
16.3.7 LLWU Flag 2 register (LLWU_F2).............................................................................................................299
16.3.8 LLWU Flag 3 register (LLWU_F3).............................................................................................................301
16.3.9 LLWU Pin Filter 1 register (LLWU_FILT1)..............................................................................................303
16.3.10 LLWU Pin Filter 2 register (LLWU_FILT2)..............................................................................................304
16.3.11 LLWU Reset Enable register (LLWU_RST)...............................................................................................305
16.4 Functional description...................................................................................................................................................306
16.4.1 LLS mode.....................................................................................................................................................306
16.4.2 VLLS modes................................................................................................................................................306
16.4.3 Initialization.................................................................................................................................................307
K20 Sub-Family Reference Manual, Rev. 2, Feb 2012
12 Freescale Semiconductor, Inc.