Rev. 1.00, 09/03, page 286 of 704
11.5.4
Timing of Counter Clear at Compare-Match
TCNT is cleared when compare-match A or compare-match B occurs, depending on the setting of
the CCLR1 and CCLR0 bits in TCR. Figure 11.8 shows the timing of clearing the counter by a
compare-match.
φ
N
H'00
Compare-match
signal
TCNT
Figure 11.8 Timing of Counter Clear by Compare-Match
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
11.9 shows the timing of clearing the counter by an external reset input.
φ
Clear signal
External reset
input pin
TCNT
N
H'00
N – 1
Figure 11.9 Timing of Counter Clear by External Reset Input
11.5.6
Timing of Overflow Flag (OVF) Setting
The OVF flag in TCSR is set to 1 by an overflow signal output when the TCNT overflows
(changes from H'FF to H'00). Figure 11.10 shows the timing of OVF flag setting.
Summary of Contents for H8S/2437
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