Rev. 1.00, 09/03, page 344 of 704
Examples of Phase Counting Mode Operation:
In phase counting mode, TCNT counts up or down according to the phase difference between two
external clocks. There are four modes, according to the count conditions.
•
Phase Counting Mode 1
Figure 12.29 shows an example of phase counting mode 1 operation, and table 12.21
summarizes the TCNT up/down-count conditions.
TCNT value
Time
Down-count
Up-count
TCLKA (channel 1)
TCLKC (channel 2)
TCLKB (channel 1)
TCLKD (channel 2)
Figure 12.29 Example of Phase Counting Mode 1 Operation
Table 12.21 Up/Down-Count Conditions in Phase Counting Mode 1
TCLKA (Channel 1)
TCLKC (Channel 2)
TCLKB (Channel 1)
TCLKD (Channel 2)
Operation
High level
Low level
Low
level
High
level
Up-count
High level
Low level
High
level
Low
level
Down-count
[Legend]
: Rising edge
: Falling edge
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