MC-78F0712-KIT Renesas Electronics America, MC-78F0712-KIT Datasheet - Page 96

• Manufacturer Part Number: MC-78F0712-KIT
• Description: KIT REF SYSTEM 78K0 UPD78F0712
• Manufacturer: Renesas Electronics America

Specifications of MC-78F0712-KIT

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

5.8
5.8.1
94
oscillation clock operation
Figure 5-13 Switching from Internal Low-speed Oscillation Clock to High-speed System Clock (Flowchart) (1/2)
Note Check the oscillation stabilization wait time of the X1 oscillator after reset release using the OSTC register
Internal low-speed
High-speed system
clock operation
Clock Switching Flowchart and Register Setting
value after reset
Register initial
Switching from internal low-speed oscillation clock to high-speed system clock
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 the high-speed system
clock operation.
(a) When X1 clock is selected as high-speed system clock by an option byte
Internal low-speed
(dividing set PCC)
oscillation clock
X1 clock oscillation
stabilization time
has not elapsed
operation
CHAPTER 5 CLOCK GENERATOR
High-speed system clock operation
User’s Manual U17890EJ2V0UD
After reset release
Each processing
OSTS = 05H
OSTC check
OSTC = 00H
MCM = 00H
MOC = 00H
PCC setting
RCM = 00H
PCC = 00H
MCM0
X1 clock oscillation stabilization time has elapsed
1
Note
Note
; f
; Enables internal low-speed oscillator oscillation
; Main system clock = f
; Enables high-speed system clock oscillation
; Oscillation stabilization time status register
; Oscillation stabilization time f
CPU
; X1 clock oscillation stabilization time status check
MCM.1 (MCS) is changed from 0 to 1
= f
RL
RL
X
/2
16