參數(shù)資料
型號： M3803
廠商： Mitsubishi Electric Corporation
英文描述： Single Chip 8 Bits Microcomputer(8位單片機)
中文描述： 單芯片8位單片機（8位單片機）
文件頁數(shù)： 38/135頁
文件大?。?/td> 2055K
代理商： M3803
38
3803/3804 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
(3) Event counter mode
G
Mode selection
This mode can be selected by setting
“
10
”
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
).
G
Explanation of operation
The operation is the same as the timer mode
’
s except that the
timer counts signals input from the CNTR
0
or CNTR
1
pin. The
valid edge for the count operation depends on 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
). When it is
“
0
”
, the
rising edge is valid. When it is
“
1
”
, the falling edge is valid.
I
Precautions
Set the double-function port of CNTR
0
/CNTR
1
pin and port P5
4
/
P5
5
to input in this mode.
(4) Pulse width measurement mode
G
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
).
G
Explanation of operation
When the CNTR
0
active edge switch bit (bit 2) or the CNTR
1
ac-
tive 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).
I
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 incon-
siderable 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.
相關(guān)PDF資料
PDF描述
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M38047M8-XXXSP SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
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