Information
Section Number Title Page
15.3.3 Low-voltage warning (LVW) interrupt operation.......................................................................................282
15.4 I/O retention..................................................................................................................................................................283
15.5 Memory map and register descriptions.........................................................................................................................283
15.5.1 Low Voltage Detect Status And Control 1 register (PMC_LVDSC1)........................................................283
15.5.2 Low Voltage Detect Status And Control 2 register (PMC_LVDSC2)........................................................285
15.5.3 Regulator Status And Control register (PMC_REGSC)..............................................................................286
Chapter 16
Low-Leakage Wakeup Unit (LLWU)
16.1 Introduction...................................................................................................................................................................289
16.1.1 Features........................................................................................................................................................289
16.1.2 Modes of operation......................................................................................................................................290
16.1.3 Block diagram..............................................................................................................................................291
16.2 LLWU signal descriptions............................................................................................................................................292
16.3 Memory map/register definition...................................................................................................................................293
16.3.1 LLWU Pin Enable 1 register (LLWU_PE1)................................................................................................294
16.3.2 LLWU Pin Enable 2 register (LLWU_PE2)................................................................................................295
16.3.3 LLWU Pin Enable 3 register (LLWU_PE3)................................................................................................296
16.3.4 LLWU Pin Enable 4 register (LLWU_PE4)................................................................................................297
16.3.5 LLWU Module Enable register (LLWU_ME)............................................................................................298
16.3.6 LLWU Flag 1 register (LLWU_F1).............................................................................................................300
16.3.7 LLWU Flag 2 register (LLWU_F2).............................................................................................................301
16.3.8 LLWU Flag 3 register (LLWU_F3).............................................................................................................303
16.3.9 LLWU Pin Filter 1 register (LLWU_FILT1)..............................................................................................305
16.3.10 LLWU Pin Filter 2 register (LLWU_FILT2)..............................................................................................306
16.3.11 LLWU Reset Enable register (LLWU_RST)...............................................................................................307
16.4 Functional description...................................................................................................................................................308
16.4.1 LLS mode.....................................................................................................................................................308
16.4.2 VLLS modes................................................................................................................................................308
16.4.3 Initialization.................................................................................................................................................309
K20 Sub-Family Reference Manual, Rev. 2, Feb 2012
12 Freescale Semiconductor, Inc.