HD6475328-CP10 Datasheet, PDF (240/459 Pages) Hitachi Semiconductor – original Hitachi CMOS microcomputer unit (MCU)

Table 11-5 Effect of Changing Internal Clock Sources (cont)
No. Description
Timing Chart
2 Low → High^*1:
CKS1 and CKS0 are
rewritten while old
Old clock
source
clock source is Low and
New clock
new clock source is High. source
TCNT clock
pulse
TCNT
N
N+1
N+2
CKS rewrite
3 High → Low^*2:
CKS1 and CKS0 are
rewritten while old
Old clock
source
clock source is High and
New clock
new clock source is Low. source
TCNT clock
pulse
TCNT
N
*3
N+1
CKS rewrite
N+2
Note: *1 Including a transition from the stopped state to High.
*2 Including a transition from High to the stopped state.
*3 The switching of clock sources is regarded as a falling edge that increments the TCNT.
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