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7721 데이터시트(PDF) 182 Page - Renesas Technology Corp

부품명 7721
상세설명  16-BIT SINGLE-CHIP MICROCOMPUTER
PDF  577 Pages
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제조업체  RENESAS [Renesas Technology Corp]
홈페이지  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

7721 데이터시트(HTML) 182 Page - Renesas Technology Corp

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TIMER B
7721 Group User’s Manual
9–15
9.4 Event counter mode
Fig. 9.4.1 Structures of timer Bj mode register and timer Bj register in event counter mode
b7
b0
b7
b0
(b15)
(b8)
Timer B0 register (Addresses 5116, 5016)
Timer B1 register (Addresses 5316, 5216)
RW
15 to 0
Bit
Functions
At reset
RW
These bits can be set to “000016” to “FFFF16.”
Assuming that the set value = n, the counter
divides the count source frequency by (n + 1).
When reading, the register indicates the
counter value.
Undefined
Note: Read from or write to this register in a unit of 16 bits.
0 0 : Count at falling edge of external signal
0 1 : Count at rising edge of external signal
1 0 : Counts at both falling and rising edges
of external signal
1 1 : Do not select.
b7
b6
b5
b4
b3
b2
b1
b0
01
Bit
Count polarity select bits
Bit name
These bits are invalid in event counter mode.
This bit is invalid in event counter mode; its value is undefined at
reading.
7
Functions
At reset
0
0
0
RW
Operating mode select bits
1
0 1 : Event counter mode
b1 b0
0
0
0
!!
0
2
RW
RW
3
4
5
6
RW
RW
—
RW
RW
Timer Bj mode register (j = 0, 1) (Addresses 5B16, 5C16)
b3 b2
Nothing is assigned.
!
Undefined
Undefined
RO



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