Datasheet

Section 5 Clock Pulse Generator
REJ09B0465-0300 Rev. 3.00 Page 129 of 982
Sep 17, 2010
H8S/20103, H8S/20203, H8S/20223, H8S/20115, H8S/20215, H8S/20235 Group
(2) Switching System Reference Clock Source
Figures 5.6 and 5.7 show clock source switching timing charts for the system reference clock.
CLKA
CLKB
SELA
SELB
φbase
[Legend]
CLKA: Clock A
CLKB: Clock B
SELA: CLKA select signal
SELB: CLKB select signal
φbase: System base clock
Note: Clock switching time is a period from the clock select signal change to the second high level of the destination clock.
Operation at CLKA Clock
switching
time
Operation at CLKB Clock
switching
time
Operation at CLKA
Figure 5.6 Timing of Clock Source Switching
(When the switching destination clock source is active)