MC9S08AC16 Datasheet, PDF (156/338 Pages) Freescale Semiconductor, Inc – 8-Bit HCS08 Central Processor Unit (CPU)

Chapter 8 Internal Clock Generator (S08ICGV4)
ICGTRM = $xx
Bit 7:0 TRIM
Only need to write when trimming internal oscillator; done in separate
operation (see example #4)
RESET
RECOVERY
FROM STOP
INITIALIZE ICG
ICGC1 = $28
ICGC2 = $31
CHECK
FLL LOCK STATUS. ^NO
LOCK = 1?
YES
CHECK
NO
FLL LOCK STATUS.
LOCK = 1?
YES
CONTINUE
CONTINUE
NOTE: THIS WILL REQUIRE THE INTERAL REFERENCE CLOCK TO START AND
STABILIZE.
Figure 8-16. ICG Initialization and Stop Recovery for Example #3
MC9S08AC16 Series Data Sheet, Rev. 0
156
PRELIMINARY
Freescale Semiconductor