HD6412320 RENESAS [Renesas Technology Corp], HD6412320 Datasheet - Page 482

• Manufacturer Part Number: HD6412320
• Description: Renesas 16-Bit Single-Chip Microcomputer H8S Family H8S-2300 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

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. 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.
Bit 4
CKEG1
0
1
Note: Internal clock edge selection is valid when the input clock is φ/4 or slower. This setting is
Bits 2 to 0—Time Prescaler 2 to 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
Channel φ/1
0
1
2
3
4
5
Legend:
o
Blank: No setting
Rev.6.00 Sep. 27, 2007 Page 452 of 1268
REJ09B0220-0600
:
ignored if the input clock is φ/1, or when overflow/underflow of another channel is selected.
Setting
Internal Clock
o
o
o
o
o
o
Bit 3
CKEG0
0
1
—
φ/4
o
o
o
o
o
o
φ/16 φ/64 φ/256 φ/1024 φ/4096
o
o
o
o
o
o
Description
Count at rising edge
Count at falling edge
Count at both edges
o
o
o
o
o
o
o
o
o
o
o
o
o
TCLKA TCLKB TCLKC TCLKD
o
o
o
o
o
o
o
o
o
External Clock
o
o
o
o
o
o
(Initial value)
Overflow/
Underflow
on Another
Channel
o
o