Rev. 1.0, 09/03, page 254 of 568
11.5.3
Timing of Timer Output When a Compare-Match Occurs
When a compare-match occurs, the timer output changes as specified by the output select bits
(OS3 to OS0) in TCSR. Figure 11.6 shows the timing when the output is set to toggle at compare-
match A.
φ
Compare-match A
signal
Timer output
pin
Figure 11.6 Timing of Timer Output
11.5.4
Timing of Compare-Match Clear When a Compare-Match Occurs
TCNT 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.
φ
N
H'00
Compare-match
signal
TCNT
Figure 11.7 Timing of Compare-Match Clear
11.5.5
TCNT External Reset Timing
TCNT is cleared at the rising edge of an external reset input, depending on the settings of the
CCLR1 and CCLR0 bits in TCR. The width of the clearing pulse must be at least 1.5 states. Figure
11.8 shows the timing of this operation.
Содержание H8S/2627
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