HD6433308 HITACHI [Hitachi Semiconductor], HD6433308 Datasheet - Page 183
HD6433308
Manufacturer Part Number
HD6433308
Description
Hitachi Single-Chip MicroComputer
Manufacturer
HITACHI [Hitachi Semiconductor]
Datasheet
1.HD6433308.pdf
(349 pages)
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The pulse that increments the timer counter is generated at the falling edge of the internal clock
source signal. If clock sources are changed when the old source is High and the new source is Low,
as in case No. 3 in Table 7-5, the changeover generates a falling edge that triggers the TCNT clock
pulse and increments the timer counter.
Switching between an internal and external clock source can also cause the timer counter to
increment. This type of switching should be avoided at external clock edges.
Table 7-5. Effect of Changing Internal Clock Sources
No.
1
2
*
*
1
2
Including a transition from Low to the stopped state (CKS1 = 0, CKS0 = 0), or a transition from
the stopped state to Low.
Including a transition from the stopped state to High.
Description
Low
CKS1 and CKS0 are
rewritten while both
clock sources are Low.
Low
CKS1 and CKS0 are
rewritten while old
clock source is Low and
new clock source is High.
Low*
High*
1
2
:
:
Old clock
source
New clock
source
TCNT clock
pulse
TCNT
Old clock
source
New clock
source
TCNT clock
pulse
TCNT
169
N
N
CKS rewrite
Timing chart
N + 1
CKS rewrite
N + 1
N + 2
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