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7721 bảng dữ liệu(PDF) 175 Page - Renesas Technology Corp

tên linh kiện 7721
Giải thích chi tiết về linh kiện  16-BIT SINGLE-CHIP MICROCOMPUTER
PDF  577 Pages
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nhà sản xuất  RENESAS [Renesas Technology Corp]
Trang chủ  http://www.renesas.com
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7721 Group User’s Manual
TIMER B
9–8
9.3 Timer mode
9.3 Timer mode
In this mode, the timer counts an internally generated count source. (Refer to “Table 9.3.1.”) Figure 9.3.1
shows the structures of the timer Bi mode register and timer Bi register in the timer mode.
Table 9.3.1 Specifications of timer mode
Item
Count source
Count operation
Division ratio
Count start condition
Count stop condition
Interrupt request occurrence timing
TBjIN pin’s function
Read from timer Bi register
Write to timer Bi register
Specifications
f2, f16, f64, or f512
•Countdown
•When a counter underflow occurs, reload register’s contents are reloaded,
and counting continues.
When the count start bit is set to “1.”
When the count start bit is cleared to “0.”
When a counter underflow occurs.
Programmable I/O port
Counter value can be read out.
q While counting is stopped
When a value is written to the timer Bi register, it is written to both
of the reload register and counter.
q While counting is in progress
When a value is written to the timer Bi register, it is written only to
the reload register. (Transferred to the counter at the next reload
time.)
1
(n + 1)
n : Timer Bi register’s set value



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