r4f2426 Renesas Electronics Corporation., r4f2426 Datasheet - Page 791

• Manufacturer Part Number: r4f2426
• Description: 16-bit Single-chip Microcomputer H8s Family / H8s/2400 Series
• Manufacturer: Renesas Electronics Corporation.

11.10.3 Caution on Cycle Setting
When counter clearing by 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 f: Counter frequency
11.10.4 Contention between TCNT Write and Clear Operations
If the counter clearing signal is generated in the T
takes precedence and the TCNT write is not performed. Figure 11.46 shows the timing in this
case.
f =
φ: Operating frequency
N: TGR set value
φ
Address
Write signal
Counter clearing
signal
TCNT
Figure 11.46 Contention between TCNT Write and Clear Operations
(N + 1)
φ
N
TCNT write cycle
TCNT address
T
1
2
state of a TCNT write cycle, TCNT clearing
T
2
Rev. 1.00 Sep. 19, 2008 Page 763 of 1270
H'0000
Section 11 16-Bit Timer Pulse Unit (TPU)
REJ09B0466-0100