MC9S08JM16 Datasheet, PDF (198/386 Pages) Freescale Semiconductor, Inc – Microcontrollers

Multi-Purpose Clock Generator (S08MCGV1)
START
IN FEI MODE
MCGC2 = $36
CHECK
NO
OSCINIT = 1 ?
YES
MCGC1 = $B8
CHECK
NO
IREFST = 0?
YES
CHECK
NO
CLKST = %10?
YES
IN
BLPE MODE ? ^NO
(LP=1)
YES
MCGC2 = $36
(LP = 0)
CHECK
NO
PLLST = 1?
YES
CHECK
NO
LOCK = 1?
YES
MCGC1 = $10
ENTER
NO
BLPE MODE ?
YES
MCGC2 = $3E
(LP = 1)
MCGC1 = $90
MCGC3 = $44
CHECK
NO
CLKST = %11?
YES
CONTINUE
IN PEE MODE
Figure 12-9. Flowchart of FEI to PEE Mode Transition using a 4 MHz Crystal
MC9S08JM16 Series Data Sheet, Rev. 2
198
Freescale Semiconductor