Renesas H8S/2100 Series Hardware Manual page 296

Section 10 16-Bit Timer Pulse Unit (TPU)
(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.
TCLKA (channel 1)
TCLKC (channel 2)
TCLKB (channel 1)
TCLKD (channel 2)
TCNT value
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)
High level
Low level
High level
Low level
[Legend]
: Rising edge
: Falling edge
Rev. 1.00 May 09, 2008 Page 270 of 954
REJ09B0462-0100
Up-count
TCLKB (Channel 1)
TCLKD (Channel 2)
Low level
High level
High level
Low level
Down-count
Operation
Up-count
Down-count
Time