Datasheet

Section 10 16-Bit Timer Pulse Unit (TPU)
Rev. 3.00 Sep. 28, 2009 Page 284 of 910
REJ09B0350-0300
(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 10.26 shows an example of phase counting mode 1 operation, and table 10.21 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 10.26 Example of Phase Counting Mode 1 Operation
Table 10.21 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
Down-count
Low level
[Legend]
: Rising edge
: Falling edge