Rev. 3.0, 10/02, page 294 of 686
TCNT value
H'FFFF
H'0000
CST bit
TCFV
Time
Figure 10.7 Free-Running Counter Operation
When compare match is selected as the TCNT clearing source, the TCNT counter for the
relevant channel performs periodic count operation. The TGR register for setting the period is
designated as an output compare register, and counter clearing by compare match is selected by
means of bits CCLR2 to CCLR0 in TCR. After the settings have been made, TCNT starts up-
count operation as periodic counter when the corresponding bit in TSTR is set to 1. When the
count value matches the value in TGR, the TGF bit in TSR is set to 1 and TCNT is cleared to
H'0000. If the value of the corresponding TGIE bit in TIER is 1 at this point, the TPU requests
an interrupt. After a compare match, TCNT starts counting up again from H'0000. Figure 10.8
illustrates periodic counter operation.
TCNT value
TGR
H'0000
CST bit
TGF
Time
Counter cleared by TGR
compare match
Flag cleared by software or
DTC activation
Figure 10.8 Periodic Counter Operation
Waveform Output by Compare Match: The TPU can perform 0, 1, or toggle output from the
corresponding output pin using compare match.
1. Example of setting procedure for waveform output by compare match
Figure 10.9 shows an example of the setting procedure for waveform output by compare
match.
Содержание H8S/2215 Series
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Страница 481: ...Rev 3 0 10 02 page 423 of 686 I O pin Control OUT IN TDI pin TDO pin Figure 14 2 Boundary Scan Register Configuration ...
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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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