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SH7018 Datasheet(PDF) 141 Page - Renesas Technology Corp

Part # SH7018
Description  SuperH??RISC engine
PDF  431 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

SH7018 Datasheet(HTML) 141 Page - Renesas Technology Corp

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125
CST bit
TCNT value
Time
H'FFFF
H'0000
TCFV
Figure 8.7 Free-Running Counter Operation
Periodic Counter Operation Example: Periodic counter operation is obtained for a given
channel’s TCNT by selecting compare-match as a TCNT clear source. Set the TGR register for
period setting to output compare register and select counter clear upon compare-match using the
CCLR2 to CCLR0 bits of the timer control register (TCR). After these settings, the TCNT begins
incrementing as a periodic counter when the corresponding bit of TSTR is set to 1. When the
count matches the TGR register value, the TGF bit in the TSR is set to 1 and the counter is cleared
to H'0000. If the TGIE bit of the corresponding TIER is set to 1 at this point, the MTU will make
an interrupt request to the interrupt controller. After the compare-match, TCNT continues counting
from H'0000. Figure 8.8 shows an example of periodic counting.
CST bit
TCNT value
Time
Counter cleared by
TGR compare match
TGR
H'0000
TGF
Flag cleared by software
activation
Figure 8.8 Periodic Counter Operation



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