HD643303x Hitachi, HD643303x Datasheet - Page 255
HD643303x
Manufacturer Part Number
HD643303x
Description
Hitachi Microcomputer
Manufacturer
Hitachi
Datasheet
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Example of Phase Counting Mode: Figure 8-44 shows an example of operations in phase
counting mode. Table 8-9 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. See figure 8-45.
Table 8-9 Up/Down Counting Conditions
Counting Direction
TCLKB
TCLKA
TCLKA
TCLKB
TCLKB
TCLKA
Figure 8-45 Phase Difference, Overlap, and Pulse Width in Phase Counting Mode
TCNT2 value
Phase
difference
Figure 8-44 Operation in Phase Counting Mode (Example)
Counting up
Up-Counting
Low
Overlap
Phase
difference
High
Overlap
High
240
Pulse width
Low
Phase difference and overlap:
Pulse width:
Down-Counting
High
Low
Pulse width
Counting down
at least 1.5 states
at least 2.5 states
Low
Time
High
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