HD6432646 Hitachi, HD6432646 Datasheet - Page 410
HD6432646
Manufacturer Part Number
HD6432646
Description
(HD64F264x Series) 16-Bit Microcomputer
Manufacturer
Hitachi
Datasheet
1.HD6432646.pdf
(1155 pages)
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10.7
Note that the kinds of operation and contention described below occur during TPU operation.
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 10-48 shows the input clock
conditions 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:
Where
376
TCLKA
(TCLKC)
TCLKB
(TCLKD)
Notes: Phase difference and overlap
Figure 10-48 Phase Difference, Overlap, and Pulse Width in Phase Counting Mode
f =
Usage Notes
f
ø : Operating frequency
N : TGR set value
Pulse width
(N + 1)
: Counter frequency
ø
Overlap
Pulse width
Phase
differ-
ence
Overlap
: 1.5 states or more
: 2.5 states or more
Phase
differ-
ence
Pulse width
Pulse width
Pulse width
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