upd78f0148m1gka1-9eu Renesas Electronics Corporation., upd78f0148m1gka1-9eu Datasheet - Page 154

• Manufacturer Part Number: upd78f0148m1gka1-9eu
• Description: 8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

6.8.3
154
Note Set CSS to 1 after confirming that oscillation of the subsystem clock is stabilized.
clock operation
Subsystem
X1 input
Switching from X1 input clock to subsystem clock
clock
Figure 6-16. Switching from X1 Input Clock to Subsystem Clock (Flowchart)
Register setting
clock operation
in X1 input
CHAPTER 6 CLOCK GENERATOR
User’s Manual U15947EJ3V1UD
Subsystem clock operation
PCC.7 (MCC) = 0
PCC.4 (CSS) = 0
CSS ← 1
MCM = 03H
Note
; X1 oscillation
; X1 input clock or internal oscillation clock
; X1 input clock operation
; Subsystem clock operation
MCS = 1 not changed.
CLS is changed from 0 to 1.