Section 9 16-Bit Timer Pulse Unit (TPU)
Rev. 3.00 Mar. 14, 2006 Page 320 of 804
REJ09B0104-0300
(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 9.26 shows an example of phase counting mode 1 operation, and table 9.35 summarizes the
TCNT up/down-count conditions.
TCNT value
Time
Down-count
Up-count
TCLKA (channels 1 and 5)
TCLKC (channels 2 and 4)
TCLKB (channels 1 and 5)
TCLKD (channels 2 and 4)
Figure 9.26 Example of Phase Counting Mode 1 Operation
Table 9.35 Up/Down-Count Conditions in Phase Counting Mode 1
TCLKA (Channels 1 and 5)
TCLKC (Channels 2 and 4)
TCLKB (Channels 1 and 5)
TCLKD (Channels 2 and 4)
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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