M32C80 Datasheet, PDF (87/352 Pages) Renesas Technology Corp – 16/32-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M32C/80 SERIES

M32C/80 Group
8. Clock Generation Circuit
Switch to the main clock
No
Determine several times whether
the CM23 bit is set to "0"
(main clock oscillates)
Yes
Set the MCD4 to MCD0 bits
to "010002" (divide-by-8 mode)
Set the CM22 bit to "0"
(main clock does not stop)
Set the CM21 bit to "0"
(main clock as CPU clock source)
MCD4 to MCD0: Bits in the MCD Register
End
CM23 to CM21: Bits in the CM2 Register
Figure 8.11 Switching Procedure from On-chip Oscillator Clock to Main Clock
Rev. 1.00 Nov. 01, 2005 Page 68 of 330
REJ09B0271-0100