HD6473032F16 Datasheet, PDF (398/847 Pages) Renesas Technology Corp – Hardware Manual Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Series

Section 10 16-Bit Integrated Timer Unit (ITU)
Example of Phase Counting Mode: Figure 10.44 shows an example of operations in phase
counting mode. Table 10.9 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
Counting down
TCLKB
Time
TCLKA
Figure 10.44 Operation in Phase Counting Mode (Example)
Table 10.9 Up/Down Counting Conditions
Counting Direction Up-Counting
TCLKB
↑
High ↓
Low
TCLKA
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 10.45 Phase Difference, Overlap, and Pulse Width in Phase Counting Mode
Rev. 3.00 Mar 21, 2006 page 368 of 814
REJ09B0302-0300