MC9S08GT16A Datasheet, PDF (150/300 Pages) Freescale Semiconductor, Inc – Microcontrollers

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 9-16. ICG Initialization and Stop Recovery for Example #3
MC9S08GT16A/GT8A Data Sheet, Rev. 1
150
Freescale Semiconductor