3069RF-ZTAT Datasheet, PDF (366/1003 Pages) Renesas Technology Corp – RENESAS 16-BIT SINGLE-CHIP MICROCOMPUTER

• Free-running and periodic counter operation
A reset leaves the counters (16TCNTs) in 16-bit timer channels 0 to 2 all set as free-running
counters. A free-running counter starts counting up when the corresponding bit in TSTR is set
to 1. When the count overflows from H'FFFF to H'0000, the OVF flag is set to 1 in TISRC.
After the overflow, the counter continues counting up from H'0000. Figure 9.13 illustrates
free-running counting.
16TCNT value
H'FFFF
H'0000
STR0 to
STR2 bit
OVF
Time
Figure 9.13 Free-Running Counter Operation
When a channel is set to have its counter cleared by compare match, in that channel 16TCNT
operates as a periodic counter. Select the output compare function of GRA or GRB, set bit
CCLR1 or CCLR0 in 16TCR to have the counter cleared by compare match, and set the count
period in GRA or GRB. After these settings, the counter starts counting up as a periodic
counter when the corresponding bit is set to 1 in TSTR. When the count matches GRA or
GRB, the IMFA or IMFB flag is set to 1 in TISRA/TISRB and the counter is cleared to
H'0000. If the corresponding IMIEA or IMIEB bit is set to 1 in TISRA/TISRB, a CPU
interrupt is requested at this time. After the compare match, 16TCNT continues counting up
from H'0000. Figure 9.14 illustrates periodic counting.
16TCNT value
GR
Counter cleared by general
register compare match
H'0000
Time
STR bit
IMF
Figure 9.14 Periodic Counter Operation
Rev. 5.0, 09/04, page 344 of 978