h8s-2649 Renesas Electronics Corporation., h8s-2649 Datasheet - Page 343

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

10.9.3
When counter clearing on compare match is set, TCNT is cleared in the final state in which it
matches the TGR value (the point at which the count value matched by TCNT is updated).
Consequently, the actual counter frequency is given by the following formula:
Where
10.9.4
If the counter clear signal is generated in the T2 state of a TCNT write cycle, TCNT clearing
takes precedence and the TCNT write is not performed.
Figure 10.45 shows the timing in this case.
f =
φ
Address
Write signal
Counter clear
signal
TCNT
Caution on Period Setting
Conflict between TCNT Write and Clear Operations
f: Counter frequency
φ: Operating frequency
N: TGR set value
(N + 1)
Figure 10.45 Conflict between TCNT Write and Clear Operations
φ
N
TCNT write cycle
TCNT address
T1
T2
H'0000
Rev. 2.00 Dec. 05, 2005 Page 305 of 724
Section 10 16-Bit Timer Pulse Unit (TPU)
REJ09B0200-0200