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KX-UDT111RU (serv.man3) - Panasonic PBX Service Manual (repair manual). Page 33

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33
KX-UDT111RU
9.7.
STM (Start Monitor)
STM means a power on sequence of software .
and it can check which part is NG 
Step
Software condition
Software start up
Initialize STM
Initialize Clock
Initialize DAIF
Initialize GPIO
Initialize SPI
Initialize RDS
Initialize SPI
Initialize RDS
Initialize Battery
Initialize KBS
System start judgment
Initialize RDS
interrupt is effective
Initialize RF
Initialize DSP
STM
High
Low
High
Low
High
Low
High
Low
High
Low
High
Low
High
Low
High
SRAM
-
-
-
-
-
-
Access
-
Access
Access
-
Access
Access
Access
Access
Access
Low
FLASH
-
-
-
-
-
-
Access
-
Access
-
-
-
-
-
Access
Access
Figure of image of STM port
Waveform of STM port
STM
SRAM_CS/ (IC100 81pin)
FLASH_CS/ (IC102 1pin)
By the Fatal reset, SMT port 
may toggle instantly at this point.
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