Datasheet

Section 9 16-Bit Timer Pulse Unit (TPU)
Rev.7.00 Feb. 14, 2007 page 364 of 1108
REJ09B0089-0700
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 9.29 shows an example of phase counting mode 1 operation, and table 9.9 summarizes
the TCNT up/down-count conditions.
TCNT value
Time
Down-countUp-count
TCLKA (channels 1 and 5)
TCLKC (channels 2 and 4)
TCLKB (channels 1 and 5)
TCLKD (channels 2 and 4)
Figure 9.29 Example of Phase Counting Mode 1 Operation
Table 9.9 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
Up-count
Low level
Low level
High level
High level Down-count
Low level
High level
Low level
Legend:
: Rising edge
: Falling edge