MC9S12P128_10 Datasheet, PDF (240/566 Pages) Freescale Semiconductor, Inc – S12 Microcontrollers

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
CPU execution
Core
Clock
PLLCLK
STOP instruction
t_{STP_REC}
interrupt continue execution
t_lock
OSCCLK
UPOSC
PLLSEL
select OSCCLK as Core/Bus Clock by writing PLLSEL to “0”
automatically set when going into Full Stop Mode
S12P-Family Reference Manual, Rev. 1.13
240
Freescale Semiconductor