Hitachi H8S/2670, Reference Manual

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TCR3—Timer Control Register 3 H'FE80 TPU3
Bit
Initial value
Read/Write
7
CCLR2
0
R/W
6
CCLR1
0
R/W
5
CCLR0
0
R/W
4
CKEG1
0
R/W
3
CKEG0
0
R/W
2
TPSC2
0
R/W
1
TPSC1
0
R/W
0
TPSC0
0
R/W
0
1
0
1
0
1
Internal clock: count on ø/1
Internal clock: count on ø/4
Internal clock: count on ø/16
Internal clock: count on ø/64
External clock: count on TCLKA pin input
Internal clock: count on ø/1024
Internal clock: count on ø/256
Internal clock: count on ø/4096
Timer Prescaler
0
1
0
1
0
1
0
1
0
1
0
1
—
Count at rising edge
Count at falling edge
Count at both edges
Clock Edge
0 0 TCNT clearing disabled
TCNT cleared by TGRA compare match/input capture
TCNT cleared by TGRB compare match/input capture
Counter Clear
0
1
1 0
1
1 0 0
1
1 0
1
TCNT cleared by counter clearing for another channel
performing synchronous clearing/synchronous operation
*
1
TCNT clearing disabled
TCNT cleared by TGRC compare match/input capture
*
2
TCNT cleared by TGRD compare match/input capture
* 2
TCNT cleared by counter clearing for another channel
performing synchronous clearing/synchronous operation
* 1
Notes: 1. Synchronous operation is selected by setting the SYNC bit
in TSYR to 1.
2. When TGRC or TGRD is used as a buffer register, TCNT is
not cleared because the buffer register setting has priority,
and compare match/input capture does not occur.