217
Example of Phase Counting Mode: Figure 8.30 shows an example of operations in phase
counting mode. Table 8.5 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 8.30 Operation in Phase Counting Mode (Example)
Table 8.5
Up/Down Counting Conditions
Counting
Direction
Up-Counting
Down-Counting
TCLKB pin
↑
High
↓
Low
HIgh
↓
Low
↑
TCLKA pin
Low
↑
High
↓
↓
Low
↑
HIgh
TCLKA
TCLKB
Phase
difference
Phase
difference
Pulse width
Pulse width
Overlap
Overlap
Phase difference and overlap:
Pulse width:
at least 1.5 states
at least 2.5 states
Figure 8.31 Phase Difference, Overlap, and Pulse Width in Phase Counting Mode
Summary of Contents for H8/3008
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