upd78f0124hgba1-8et-a Renesas Electronics Corporation., upd78f0124hgba1-8et-a Datasheet - Page 120

• Manufacturer Part Number: upd78f0124hgba1-8et-a
• Description: 8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

5.8.4 Switching from subsystem clock to high-speed system clock
120
High-speed system
clock operation
cock operation
Subsystem
Figure 5-17. Switching from Subsystem Clock to High-Speed System Clock (Flowchart)
No: High-speed system
High-speed system
clock oscillation
stabilization time
not elapsed
clock oscillating
CHAPTER 5 CLOCK GENERATOR
User’s Manual U16962EJ3V0UD
High-speed system clock operation
PCC.4 (CSS) = 1
OSTC check
MCM = 03H
MCC = 1?
MCC ← 0
CSS ← 0
High-speed system clock oscillation stabilization time elapsed
Yes: High-speed system clock oscillation stopped
; Subsystem clock operation
CLS is changed from 1 to 0.
MCS = 1 not changed.
; High-speed system clock oscillating?
; High-speed system clock oscillation enabled
; Wait for high-speed system clock oscillation
; High-speed system clock operation
stabilization time