Datasheet

Chapter 8 Internal Clock Generator (S08ICGV4)
MC9S08AW60 Data Sheet, Rev 2
150 Freescale Semiconductor
Bits 11:0 FLT No need for user initialization
ICGTRM = $xx
Bits 7:0 TRIM Only need to write when trimming internal oscillator; not used when external
crystal is clock source
Figure 8-14 shows flow charts for three conditions requiring ICG initialization.
Figure 8-14. ICG Initialization for FEE in Example #1
RESET
CONTINUE
RECOVERY FROM STOP
CHECK
LOCK = 1?
NO
YES
FLL LOCK STATUS.
INITIALIZE ICG
ICGC1 = $38
ICGC2 = $00
RECOVERY FROM STOP
OSCSTEN = 1
OSCSTEN = 0
CONTINUE
CHECK
LOCK = 1?
NO
YES
FLL LOCK STATUS.
CONTINUE
CHECK
LOCK = 1?
NO
YES
FLL LOCK STATUS.
NOTE: THIS WILL REQUIRE THE OSCILLATOR TO START AND
STABILIZE. ACTUAL TIME IS DEPENDENT ON CRYSTAL /RESONATOR
AND EXTERNAL CIRCUITRY.
QUICK RECOVERY FROM STOP MINIMUM CURRENT DRAW IN STOP