
CHAPTER 5 CLOCK GENERATOR
Preliminary User’s Manual U16315EJ1V0UD
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5.8.2 Switching from X1 input clock to Ring-OSC clock
Figure 5-15. Switching from X1 Input Clock to Ring-OSC Clock (Flowchart)
MCM.1 (MCS) is changed from 1 to 0
; Ring-OSC clock operation
; Ring-OSC oscillating?
Ring-OSC clock operation
; X1 oscillation
; X1 input clock or Ring-OSC clock
; X1 input 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
MCM0
←
0
Register setting
in X1 input
clock operation
X1 input
clock operation
Ring-OSC
clock operation
Note
Required only when “clock can be stopped by software” is selected for Ring-OSC by a mask option.