CHAPTER 5 CLOCK GENERATOR
User’s Manual U16899EJ2V0UD
131
5.8 Clock Switching Flowchart and Register Setting
5.8.1 Switching from Ring-OSC clock to high-speed system clock
Figure 5-14. Switching from Ring-OSC Clock to High-Speed System Clock (Flowchart)
; f
CPU
= f
R
; Ring-OSC oscillation
; Ring-OSC clock operation
; High-speed system clock oscillation
; Oscillation stabilization time status register
; Oscillation stabilization time f
XP
/2
16
MCM.1 (MCS) is changed from 0 to 1
; High-speed system clock oscillation
stabilization time status check
High-speed system clock oscillation stabilization time has elapsed
High-speed system clock
oscillation stabilization
time has not elapsed
PCC = 00H
RCM = 00H
MCM = 00H
MOC = 00H
OSTC = 00H
OSTS = 05H
Note
OSTC check
Note
Each processing
After reset
PCC setting
MCM.0
←
1
High-speed system clock operation
Ring-OSC
clock operation
(dividing set PCC)
Register value
after reset
Ring-OSC clock
operation
High-speed system
clock operation
Note Check the oscillation stabilization wait time of the high-speed system clock oscillator after reset release
using the OSTC register and then switch to the high-speed system clock operation after the oscillation
stabilization wait time has elapsed. The OSTS register setting is valid only after STOP mode is released by
interrupt during high-speed system clock operation.
Содержание MuPD78F0132H
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