HD6433935 Hitachi, HD6433935 Datasheet - Page 241

• Manufacturer Part Number: HD6433935
• Description: 8-Bit MICROCONTROLLER
• Manufacturer: Hitachi

No.
4
Note:
2. Notes on port mode register modification
The following points should be noted when a port mode register is modified to switch the input
capture function or the input capture input noise canceler function.
Note that when the pin function is switched by modifying TMIG in port mode register 1 (PMR1),
which performs input capture input pin control, an edge will be regarded as having been input at
the pin even though no valid edge has actually been input. Input capture input signal input edges,
and the conditions for their occurrence, are summarized in table 9-15.
Switching input capture input pin function
Clock Levels Before and After
Modifying Bits CKS1 and CKS0
Goes from high level to high level
*
The switchover is seen as a falling edge, and TCG is incremented.
TCG Operation
TCG
Clock before
switching
Clock before
switching
Count
clock
N
N+1
Write to CKS1 and CKS0
N+2
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