Clock Switching Flowchart And Register Setting; Switching From Ring-Osc Clock To X1 Input Clock; Switching From Ring-Osc Clock To X1 Input Clock (Flowchart) - NEC 78K0 User Manual

8-bit single-chip microcontrollers

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Clock Switching Flowchart and Register Setting

Figure 6-14. Switching from Ring-OSC Clock to X1 Input Clock (Flowchart)

value after reset

X1 oscillation stabilization

time has not elapsed

Ring-OSC clock

clock operation

(dividing set PCC)

X1 input clock

Note Check the oscillation stabilization wait time of the X1 oscillator after reset release using the OSTC register

and then switch to the X1 input 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 X1 input clock operation.

CHAPTER 6 CLOCK GENERATOR

After reset release

Each processing

X1 oscillation stabilization time has elapsed

X1 input clock operation

User's Manual U15947EJ2V0UD

; Ring-OSC oscillation

; Ring-OSC clock operation

; X1 oscillation

; Oscillation stabilization time status register

; Oscillation stabilization time f

; X1 oscillation stabilization time status check

MCM.1 (MCS) is changed from 0 to 1

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