Rev. 3.0, 10/02, page 336 of 686
11.5.2
Setting of Compare Match Flags CMFA and CMFB
The CMFA and CMFB flags in TCSR are set to 1 by a compare match signal generated when the
TCOR and TCNT values match. The compare match signal is generated at the last state in which
the match is true, just before the timer counter is updated. Therefore, when TCOR and TCNT
match, the compare match signal is not generated until the next incrementation clock input. Figure
11.5 shows this timing.
ø
TCNT
N
N+1
TCOR
N
Compare match
signal
CMF
Figure 11.5 Timing of CMF Setting
11.5.3
Timer Output Timing
When compare match A or B occurs, the timer output changes as specified by bits OS3 to OS0 in
TCSR. Figure 11.6 shows the timing when the output is set to toggle at compare match A.
ø
Compare match A
signal
Timer output pin
Figure 11.6 Timing of Timer Output
11.5.4
Timing of Compare Match Clear
The timer counter is cleared when compare match A or B occurs, depending on the setting of the
CCLR1 and CCLR0 bits in TCR. Figure 11.7 shows the timing of this operation.
Содержание H8S/2215 Series
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Страница 721: ...Rev 3 0 10 02 page 663 of 686 ø A23 to A0 to tBRQS tBACD tBZD tBACD tBZD tBRQS Figure 24 11 External Bus Release Timing ...
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