Information

Section Number Title Page
Chapter 6
Reset and Boot
6.1 Introduction...................................................................................................................................................................153
6.2 Reset..............................................................................................................................................................................154
6.2.1 Power-on reset (POR)..................................................................................................................................154
6.2.2 System reset sources....................................................................................................................................154
6.2.3 MCU Resets.................................................................................................................................................158
6.2.4 Reset Pin .....................................................................................................................................................160
6.2.5 Debug resets.................................................................................................................................................160
6.3 Boot...............................................................................................................................................................................161
6.3.1 Boot sources.................................................................................................................................................161
6.3.2 Boot options.................................................................................................................................................161
6.3.3 FOPT boot options.......................................................................................................................................162
6.3.4 Boot sequence..............................................................................................................................................163
Chapter 7
Power Management
7.1 Introduction...................................................................................................................................................................165
7.2 Power modes.................................................................................................................................................................165
7.3 Entering and exiting power modes...............................................................................................................................167
7.4 Power mode transitions.................................................................................................................................................168
7.5 Power modes shutdown sequencing.............................................................................................................................169
7.6 Module Operation in Low Power Modes......................................................................................................................170
7.7 Clock Gating.................................................................................................................................................................173
Chapter 8
Security
8.1 Introduction...................................................................................................................................................................175
8.2 Flash Security...............................................................................................................................................................175
8.3 Security Interactions with other Modules.....................................................................................................................176
8.3.1 Security Interactions with EzPort................................................................................................................176
8.3.2 Security Interactions with Debug.................................................................................................................176
K20 Sub-Family Reference Manual, Rev. 2, Feb 2012
Freescale Semiconductor, Inc. 7