參數(shù)資料
型號: M38030F2L-XXXWG
廠商: Renesas Technology Corp.
英文描述: SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
中文描述: 單芯片8位CMOS微機
文件頁數(shù): 31/119頁
文件大?。?/td> 1575K
代理商: M38030F2L-XXXWG
Rev.1.00
REJ03B0212-0100
Apr 2, 2007
Page 31 of 117
3803 Group (Spec.L)
(4) Pulse Width Measurement Mode
Mode selection
This mode can be selected by setting “11” to the timer X
operating mode bits (bits 1 and 0) and the timer Y operating
mode bits (bits 5 and 4) of the timer XY mode register (address
0023
16
).
Explanation of operation
When the CNTR
0
active edge switch bit (bit 2) or the CNTR
1
active edge switch bit (bit 6) of the timer XY mode register
(address 0023
16
) is “1”, the timer counts during the term of one
falling edge of CNTR
0
/CNTR
1
pin input until the next rising
edge of input (“L” term). When it is “0”, the timer counts during
the term of one rising edge input until the next falling edge input
(“H” term).
Precautions
Set the double-function port of CNTR
0
/CNTR
1
pin and port
P5
4
/P5
5
to input in this mode.
The count operation can be stopped by setting “1” to the timer X
count stop bit (bit 3) and the timer Y count stop bit (bit 7) of the
timer XY mode register (address 0023
16
). The interrupt request
bit is set to “1” each time the timer underflows.
Precautions when switching count source
When switching the count source by the timer 12, X and Y count
source selection bits, the value of timer count is altered in
inconsiderable amount owing to generating of thin pulses on the
count input signals.
Therefore, select the timer count source before setting the value
to the prescaler and the timer.
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