CHAPTER 5 CLOCK GENERATOR
User’s Manual U16899EJ2V0UD
132
5.8.2 Switching from high-speed system clock to Ring-OSC clock
Figure 5-15. Switching from High-Speed System Clock to Ring-OSC Clock (Flowchart)
MCM.1 (MCS) is changed from 1 to 0
; Ring-OSC oscillating
; Ring-OSC oscillating?
Ring-OSC clock operation
; High-speed system clock oscillation
; High-speed system clock or Ring-OSC clock
; High-speed system clock operation
No: RSTOP = 0
Yes: RSTOP = 1
PCC.7 (MCC) = 0
PCC.4 (CSS) = 0
MCM = 03H
RCM.0
Note
(RSTOP) = 1?
RSTOP = 0
MCM.0
←
0
Register setting
in high-speed system
clock operation
High-speed
system clock
operation
Ring-OSC
clock operation
Note Required only when “can be stopped by software” is selected for Ring-OSC by the option byte.