h8s-2649 Renesas Electronics Corporation., h8s-2649 Datasheet - Page 275

• Manufacturer Part Number: h8s-2649
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2600 Series
• Manufacturer: Renesas Electronics Corporation.

10.3.1
The TCR registers are 8-bit readable/writable registers that control the TCNT operation for each
channel. The TPU has a total of six TCR registers, one for each channel (channel 0 to 5). TCR
register settings should be conducted only when TCNT operation is stopped.
Bit
7
6
5
4
3
2
1
0
Bit Name
CCLR2
CCLR1
CCLR0
CKEG1
CKEG0
TPSC2
TPSC1
TPSC0
Timer Control Register (TCR)
Initial
value
0
0
0
0
0
0
0
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Description
Counter Clear 0 to 2
These bits select the TCNT counter clearing source.
See tables 10.3 and 10.4 for details.
Clock Edge 0 and 1
These bits select the input clock edge. When the input
clock is counted using both edges, the input clock
period is halved (e.g. φ/4 both edges = φ/2 rising edge).
If phase counting mode is used on channels 1, 2, 4, and
5, this setting is ignored and the phase counting mode
setting has priority. Internal clock edge selection is valid
when the input clock is φ/4 or slower. This setting is
ignored if the input clock is φ/1, or when
overflow/underflow of another channel is selected.
00: Count at rising edge
01: Count at falling edge
1X: Count at both edges
[Legend]
X: Don't care
Time Prescaler 0 to 2
These bits select the TCNT counter clock. The clock
source can be selected independently for each channel.
See tables10.5 to 10.10 for details.
Rev. 2.00 Dec. 05, 2005 Page 237 of 724
Section 10 16-Bit Timer Pulse Unit (TPU)
REJ09B0200-0200