Rev. 1.0, 09/01, page 532 of 904
2. Free-running count operation and periodic count operation
Immediately after a reset, the TPU’s TCNT counters are all designated as free-running
counters. When the relevant bit in TSTR is set to 1 the corresponding TCNT counter starts up-
count operation as a free-running counter. When TCNT overflows (changes from H'FFFF to
H'0000), the TCFV bit in TSR is set to 1. If the value of the corresponding TCIEV bit in TIER
is 1 at this point, the TPU requests an interrupt. After overflow, TCNT starts counting up again
from H'0000.
Figure 11.3 illustrates free-running counter operation.
TCNT value
H'FFFF
H'0000
CST bit
TCFV
Time
Figure 11.3 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
count-up operation as a 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 11.4 illustrates periodic counter operation.
Summary of Contents for H8S/2376 F-ZTAT
Page 24: ...Rev 1 0 09 01 page xxiv of xliv ...
Page 38: ...Rev 1 0 09 01 page xxxviii of xliv ...
Page 44: ...Rev 1 0 09 01 page xliv of xliv ...
Page 60: ...Rev 1 0 09 01 page 16 of 904 ...
Page 96: ...Rev 1 0 09 01 page 52 of 904 ...
Page 116: ...Rev 1 0 09 01 page 72 of 904 ...
Page 148: ...Rev 1 0 09 01 page 104 of 904 ...
Page 284: ...Rev 1 0 09 01 page 240 of 904 ...
Page 422: ...Rev 1 0 09 01 page 378 of 904 ...
Page 634: ...Rev 1 0 09 01 page 590 of 904 ...
Page 656: ...Rev 1 0 09 01 page 612 of 904 ...
Page 668: ...Rev 1 0 09 01 page 624 of 904 ...
Page 780: ...Rev 1 0 09 01 page 736 of 904 ...
Page 796: ...Rev 1 0 09 01 page 752 of 904 ...
Page 806: ...Rev 1 0 09 01 page 762 of 903 ...
Page 808: ...Rev 1 0 09 01 page 764 of 904 ...
Page 921: ...Rev 1 0 09 01 page 877 of 904 ø tBRQOD tBRQOD Figure 24 24 External Bus Request Output Timing ...
Page 938: ...Rev 1 0 09 01 page 894 of 904 ...