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H8S2245 bảng dữ liệu(PDF) 395 Page - Renesas Technology Corp

tên linh kiện H8S2245
Giải thích chi tiết về linh kiện  Renesas 16-Bit Single-Chip Microcomputer H8S Family / H8S/2200 Series
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nhà sản xuất  RENESAS [Renesas Technology Corp]
Trang chủ  http://www.renesas.com
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H8S2245 bảng dữ liệu(HTML) 395 Page - Renesas Technology Corp

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Section 9 16-Bit Timer Pulse Unit (TPU)
Rev.3.00 Mar. 26, 2007 Page 353 of 772
REJ09B0355-0300
Caution on Period 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:
f =
φ
(N + 1)
Where
f: Counter frequency
φ: Operating frequency
N: TGR set value
Contention between TCNT Write and Clear Operations
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 9.45 shows the timing in this case.
Counter clear
signal
Write signal
Address
φ
TCNT address
TCNT
TCNT write cycle
T1
T2
N
H'0000
Figure 9.45 Contention between TCNT Write and Clear Operations



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