UPD78F0138 NEC, UPD78F0138 Datasheet - Page 141

• Manufacturer Part Number: UPD78F0138
• Description: (UPD78xxxx) 8-Bit Single-Chip Microcontrollers
• Manufacturer: NEC

5.8.3 Switching from X1 input clock to subsystem clock
Note Set CSS to 1 after confirming that oscillation of the subsystem clock is stabilized.
clock operation
Subsystem
X1 input
clock
Figure 5-16. Switching from X1 Input Clock to Subsystem Clock (Flowchart)
Register setting
clock operation
in X1 input
CHAPTER 5 CLOCK GENERATOR
User’s Manual U16228EJ2V0UD
Subsystem clock operation
PCC.7 (MCC) = 0
PCC.4 (CSS) = 0
CSS
MCM = 03H
1
Note
; X1 oscillation
; X1 input clock or Ring-OSC clock
; X1 input clock operation
; Subsystem clock operation
MCS = 1 not changed.
CLS is changed from 0 to 1.
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