h8s-2635 Renesas Electronics Corporation., h8s-2635 Datasheet - Page 366

• Manufacturer Part Number: h8s-2635
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2600 Series
• Manufacturer: Renesas Electronics Corporation.

Section 10 16-Bit Timer Pulse Unit (TPU)
Bits 4 and 3—Clock Edge 1 and 0 (CKEG1, CKEG0): These bits select the input clock edge.
When the input clock is counted using both edges, the input clock period is halved (e.g. /4 both
edges = /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.
Note: Internal clock edge selection is valid when the input clock is /4 or slower. This setting is
Bits 2 to 0—Time Prescaler 2, 1, and 0 (TPSC2 to TPSC0): These bits select the TCNT counter
clock. The clock source can be selected independently for each channel. Table 10-4 shows the
clock sources that can be set for each channel.
Table 10-4 TPU Clock Sources
Legend:
Blank: No setting
Rev. 6.00 Feb 22, 2005 page 306 of 1484
REJ09B0103-0600
Bit 4
CKEG1
0
1
Channel
:
0
1
2
3
4
5
ignored if the input clock is /1, or when overflow/underflow of another channel is selected.
Setting
/1
Bit 3
CKEG0
0
1
—
/4
/16
Description
Count at rising edge
Count at falling edge
Count at both edges
Internal Clock
/64
/256
/1024
/4096 TCLKA TCLKB TCLKC TCLKD
External Clock
(Initial value)
on Another
Underflow
Overflow/
Channel