S12 Clock, Reset and Power Management Unit (S12CPMU)
7.4.4
Full Stop Mode using Oscillator Clock as Bus Clock
An example of what happens going into Full Stop Mode and exiting Full Stop Mode after an interrupt is
shown in Figure 7-33.
Disable PLL Lock interrupt (LOCKIE=0) and oscillator status change interrupt (OSCIE=0) before going
into Full Stop Mode.
Figure 7-33. Full Stop Mode using Oscillator Clock as Bus Clock
wakeup
interrupt continue execution
execution
STOP instruction
CPU
Core
Clock
t
STP_REC
t
lock
PLLCLK
OSCCLK
UPOSC
select OSCCLK as Core/Bus Clock by writing PLLSEL to “0”
PLLSEL
automatically set when going into Full Stop Mode
S12P-Family Reference Manual, Rev. 1.13
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Freescale Semiconductor