upd78f0134hgka1-9et-a Renesas Electronics Corporation., upd78f0134hgka1-9et-a Datasheet - Page 134

• Manufacturer Part Number: upd78f0134hgka1-9et-a
• Description: 8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

5.8.3 Switching from high-speed system clock to subsystem clock
134
High-speed system
clock operation
Note Set CSS to 1 after confirming that oscillation of the subsystem clock is stabilized.
Subsystem
clock
Figure 5-16. Switching from High-Speed System Clock to Subsystem Clock (Flowchart)
in high-speed system
Register setting
clock operation
CHAPTER 5 CLOCK GENERATOR
Subsystem clock operation
User’s Manual U16899EJ3V0UD
PCC.7 (MCC) = 0
PCC.4 (CSS) = 0
CSS
MCM = 03H
1
Note
; High-speed system clock oscillation
; High-speed system clock or Internal oscillation clock
; High-speed system clock operation
; Subsystem clock operation
MCS = 1 not changed.
CLS is changed from 0 to 1.