3069RF-ZTAT Datasheet, PDF (379/1003 Pages) Renesas Technology Corp – RENESAS 16-BIT SINGLE-CHIP MICROCOMPUTER

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 16TCNT2.
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.
16TCNT2 value
Counting up
Counting down
TCLKB
TCLKA
Figure 9.30 Operation in Phase Counting Mode (Example)
Table 9.5 Up/Down Counting Conditions
Counting
Direction
TCLKB pin
TCLKA pin
Up-Counting
High
Low
Low
High
Down-Counting
HIgh
Low
Low
HIgh
Phase
difference
Phase
difference
Pulse width
Pulse width
TCLKA
TCLKB
Overlap
Overlap
Phase difference and overlap: at least 1.5 states
Pulse width:
at least 2.5 states
Figure 9.31 Phase Difference, Overlap, and Pulse Width in Phase Counting Mode
Rev. 5.0, 09/04, page 357 of 978