M306H7MG-XXXFP Datasheet, PDF (32/329 Pages) Renesas Technology Corp – SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER with DATA ACQUISITION CONTROLLER

M306H7MG-XXXFP/MC-XXXFP/FGFP
4. CLOCK GENERATION CIRCUIT
Using the main clock from the sub clock as CPU clock
source.
Set the CM07 bit to “1” (sub clock).
Set the CM05 bit to “0” (oscillating).
Waits until the main clock becomes stable.
Set the CM07 bit to “0” (main clock). (note1)
Set the main clock division ratio.
Set the CM17 to the CM16 bits to “002,” set the CM06 bit to
“0.” (CM16 bit and CM17 bit are effective) (notes 2.)
END
Note 1: Change After the oscillation of the main clock becomes stable enough.
Note 2: Setting No division of the main clock is shown.
Change CM06 after changing CM17 and CM16.
Figure 4.7 Procedure to Use the Main Clock from the Sub Clock as CPU Clock Source
Rev.2.10 Oct 25, 2006 Page 32 of 326
REJ03B0152-0210