h8s-2161b Renesas Electronics Corporation., h8s-2161b Datasheet - Page 388
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h8s-2161b
Manufacturer Part Number
h8s-2161b
Description
Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2100 Series
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.H8S-2161B.pdf
(845 pages)
- Current page: 388 of 845
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Section 13 Timer Connection
13.4.4
By using the timer connection facility and FRT, even if there is a part of the IHI signal with twice
the frequency, this can be eliminated. In order for this function to operate properly, the duty cycle
of the IHI signal must be approximately 30% or less, or approximately 70% or above.
The 8-bit OCRDM contents or twice the OCRDM contents can be added automatically to the data
captured in ICRD in the FRT, and compare-matches generated at these points. The interval
between the two compare-matches is called a mask interval. A value equivalent to approximately
1/3 the IHI signal period is written in OCRDM. ICRD is set so that capture is performed on the
rise of the IHI signal.
Since the IHI signal supplied to the IHO signal selection circuit is normally set on the rise of the
IHI signal and reset on the fall, its waveform is the same as that of the original IHI signal. When
2fH modification is selected, IHI signal edge detection is disabled during mask intervals. Capture
is also disabled during these intervals.
Examples of TCR, TCSR, TOCR, and OCRDM settings in the FRT are shown in table 13.7, and
the 2fH modification timing chart is shown in figure 13.6.
Rev. 3.00 Mar 21, 2006 page 334 of 788
REJ09B0300-0300
2fH Modification of IHI Signal
IVI signal
IHI signal
divided
waveform
Figure 13.5 Timing Chart for Measurement of IVI Signal and
FRC
ICRB
ICRB(1)
IHI Signal Divided Waveform Periods
ICRB(2)
ICRB(3)
ICRB(4)
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