HD6433640 HITACHI [Hitachi Semiconductor], HD6433640 Datasheet - Page 247
HD6433640
Manufacturer Part Number
HD6433640
Description
H8/3644 Series Hardware Manual
Manufacturer
HITACHI [Hitachi Semiconductor]
Datasheet
1.HD6433640.pdf
(508 pages)
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Contention between Compare Match A and B: If compare match A and B occur
simultaneously, any conflict between the output selections for compare match A and compare
match B is resolved by following the priority order in table 9.12.
Table 9.12 Timer Output Priority Order
Output Setting
Toggle output
1 output
0 output
No change
Internal Clock Switching and Counter Operation: Depending on the timing, TCNTV may be
incremented by a switch between different internal clock sources. Table 9.13 shows the relation
between internal clock switchover timing (by writing to bits CKS1 and CKS0) and TCNTV
operation.
When TCNTV is internally clocked, an increment pulse is generated from the falling edge of an
internal clock signal, which is divided from the system clock (ø). For this reason, in a case like No.
3 in table 9.13 where the switch is from a high clock signal to a low clock signal, the switchover is
seen as a falling edge, causing TCNTV to increment.
TCNTV can also be incremented by a switch between internal and external clocks.
Priority
High
Low
239
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