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AN4253 датащи(PDF) 18 Page - STMicroelectronics

номер детали AN4253
подробное описание детали  SPC564Lx device startup flow
PDF  44 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN4253 датащи(HTML) 18 Page - STMicroelectronics

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Safe mode block
AN4253
18/44
DocID024255 Rev 2
6
Safe mode block
Figure 8. Flow of the "Safe mode handling" phase
Safe mode is a special mode of the microcontroller where only limited part of the hardware
functionality is enabled to the user. All attempts to change the HW configuration are blocked
until fault conditions are removed.
Very often safe mode is observed in the startup phase after a functional reset other then
functional reset initiated from software. In such situation startup has to leave safe mode
prior to any mode change transition.
Conditions to leave safe mode are:
•
No FCCU fault pending
•
FCCU flags in RGM.FES register cleared
6.1
Read current mode of the microcontroller
Current mode of the microcontroller is reported in Mode Entry Global Status (ME.GS)
register.
6.1.1
Code sequence
1.
32 bit read of ME.GS register (0xC3FDC000)
6.2
Safe mode check
It is needed to extract S_CURRENT_MODE bit field from the read value. There are only two
possible values after the reset:
•
2 = SAFE
•
3 = DRUN



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