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Section 9 16-Bit Timer
Example of Phase Counting Mode: Figure 9.30 shows an example of operations in phase
counting mode. Table 9.5 lists the up-counting and down-counting conditions for TCNT2.
In phase counting mode both the rising and falling edges of TCLKA and TCLKB are counted. The
phase difference between TCLKA and TCLKB must be at least 1.5 states, the phase overlap must
also be at least 1.5 states, and the pulse width must be at least 2.5 states.
TCNT2 value
Counting up
TCLKB
TCLKA
Figure 9.30 Operation in Phase Counting Mode (Example)
Table 9.5
Up/Down Counting Conditions
Counting Direction
TCLKB pin
TCLKA pin
Phase
difference
TCLKA
TCLKB
Figure 9.31 Phase Difference, Overlap, and Pulse Width in Phase Counting Mode
Rev. 4.00 Jan 26, 2006 page 378 of 938
REJ09B0276-0400
Up-Counting
High
Low
High
Phase
difference
Overlap
Overlap
Down-Counting
Low
High
Low
Pulse width
Phase difference and overlap:
Pulse width:
Counting down
Time
Low
High
Pulse width
at least 1.5 states
at least 2.5 states
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