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(2)
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.
(a)
Phase counting mode 1
Figure 9.25 shows an example of phase counting mode 1 operation, and table 9.33 summarizes the
TCNT up/down-count conditions.
TCLKA (channels 1 and 5)
TCLKC (channels 2 and 4)
TCLKB (channels 1 and 5)
TCLKD (channels 2 and 4)
TCNT value
Figure 9.25 Example of Phase Counting Mode 1 Operation
Table 9.33 Up/Down-Count Conditions in Phase Counting Mode 1
TCLKA (Channels 1 and 5)
TCLKC (Channels 2 and 4)
High level
Low level
High level
Low level
[Legend]
:
Rising edge
:
Falling edge
Up-count
TCLKB (Channels 1 and 5)
TCLKD (Channels 2 and 4)
Low level
High level
High level
Low level
Section 9 16-Bit Timer Pulse Unit (TPU)
Down-count
Operation
Up-count
Down-count
Rev.2.00 Jun. 28, 2007 Page 365 of 666
REJ09B0311-0200
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