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H8S2245 bảng dữ liệu(PDF) 423 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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Section 10 8-Bit Timers
Rev.3.00 Mar. 26, 2007 Page 381 of 772
REJ09B0355-0300
10.6
Usage Notes
Application programmers should note that the following kinds of contention can occur in the 8-bit
timer.
10.6.1
Setting Module Stop Mode
The TMR is enabled or disabled by setting the module stop control register. In the initial state, the
TMR is disabled. After the module stop mode is canceled, registers can be accessed. For details,
see section 18, Power-Down Modes.
10.6.2
Contention between TCNT Write and Clear
If a timer counter clock pulse is generated during the T2 state of a TCNT write cycle, the clear
takes priority, so that the counter is cleared and the write is not performed.
Figure 10.10 shows this operation.
φ
Address
TCNT address
Internal write signal
Counter clear signal
TCNT
N
H'00
T1
T2
TCNT write cycle by CPU
Figure 10.10 Contention between TCNT Write and Clear



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