MC9S12E256 Datasheet, PDF (193/602 Pages) Freescale Semiconductor, Inc – HCS12 Microcontrollers

Chapter 4 Clocks and Reset Generator (CRGV4)
Exit Stop w.
ext.RESET
Wait Mode left
due to external
Core req’s
Stop Mode.
Clear
PLLSEL,
Disable PLL
Enter
Stop Mode
no
no
Exit Stop w. no
CMRESET
SCME=1
?
yes
Exit
Stop Mode
INT
no
?
yes
PSTP=1 ^yes
?
CME=1 ^no
?
yes
Clock
OK
?
yes
Exit Stop w. no
CMRESET
CM fail no
?
yes
SCME=1
?
yes
Exit
Stop Mode
Generate
SCM Interrupt
(Wakeup from Stop)
SCMIE=1 ^no
?
yes
Exit
Stop Mode
Enter
Enter
SCM
SCM
no
INT
?
yes
Exit
Stop Mode
SCM=1 no
?
yes
Enter
SCM
Continue w.
normal OP
Figure 4-24. Stop Mode Entry/Exit Sequence
MC9S12E256 Data Sheet, Rev. 1.08
Freescale Semiconductor
193