Rev. 1.00, 09/03, page 357 of 704
12.8 Usage
Notes
Input Clock Restrictions:
The input clock pulse width must be at least 1.5 states in the case of single-edge detection, and at
least 2.5 states in the case of both-edge detection. The TPU will not operate properly with a
narrower pulse width.
In phase counting mode, the phase difference and overlap between the two input clocks must be at
least 1.5 states, and the pulse width must be at least 2.5 states. Figure 12.46 shows the input clock
conditions in phase counting mode.
Overlap
Phase
differ-
ence
Phase
differ-
ence
Overlap
TCLKA
(TCLKC)
TCLKB
(TCLKD)
Pulse width
Pulse width
Pulse width
Pulse width
Notes: Phase difference and overlap
Pulse width
: 1.5 states or more
: 2.5 states or more
Figure 12.46 Phase Difference, Overlap, and Pulse Width in Phase Counting Mode
Caution on Period Setting:
When counter clearing by compare match is set, TCNT is cleared in the final state in which it
matches the TGR value (the point at which the count value matched by TCNT is updated).
Consequently, the actual counter frequency is given by the following formula:
φ
f = ————
(N + 1)
Where f: Counter frequency
φ
: Operating frequency
N: TGR set value
Содержание H8S/2437
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