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參數(shù)資料
| 型號： | M38198M7-XXXFP |
| 廠商： | Mitsubishi Electric Corporation |
| 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)： | 44/60頁 |
| 文件大小： | 664K |
| 代理商： | M38198M7-XXXFP |
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44
3819 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
NOISE FILTER
The noise filter uses a sampling clock to remove the noise compo-
nent digitally from the input signal of P4
5
/INT
1
/ZCR pin. The
sampling clock can be selected from 8
μ
s, 16
μ
s, or 32
μ
s (at
f(X
IN
)= 8.38 MHz) and this is used to change the noise component
to be removed. It is also possible to generate an internal trigger
and INT
1
/ZCR interrupt request directly without passing through
the noise filter. When passing through the noise filter, either both-
sided edge detection or one-sided edge detection can be selected
as the interrupt request generating source. The zero cross detec-
tion control register is used for this selection. Furthermore, switch
between rising edge and falling edge is performed with the bit 1 of
the interrupt edge selection register (address 003A
16
).
Fig. JE-4 Noise filter circuit diagram
Fig. JE-5 Timing of noise filter circuit
Input signal from
P4
5
/INT
1
/ZCR pin
Sampling clock
RESET
R
Q
D
C
R
Q
D
C
Q
S
R
R
Q
D
C
“1”
“0”
One-sided/both-sided edge
detection selection bit
(bit 4 of ZCRCON)
INT
1
/ZCR
interrupt request
C
B
A
RESET
Sampling clock
Input signal from
P4
5
/INT
1
/ZCR pin
A
B
C
(one-sided edge)
(both-sided edge)
INT
1
/ZCR
interrupt request
P4
5
/INT
1
/ZCR
(Note 1)
0 V
(Note 2)
Switched with
bit 4 of ZCRCON
:
Ignored this because of treating this as noise
:
INT
1
/ZCR interrupt request occurs
Notes 1
2
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