參數(shù)資料
型號(hào)： M38199MF-XXXFP
元件分類： 微控制器/微處理器
英文描述： 8-BIT, MROM, 4.2 MHz, MICROCONTROLLER, PQFP100
封裝： 14 X 20 MM, 0.65 MM PITCH, PLASTIC, QFP-100
文件頁數(shù)： 41/63頁
文件大小： 870K
代理商： M38199MF-XXXFP
43
3819 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
ZERO CROSS DETECTION CIRCUIT
The zero cross detection circuit compares the voltage applied to
P45/INT1/ZCR pin and VSS. The result can be read from the zero
cross detection circuit input bit (bit 7) of the zero cross detection
control register. It is set to “1” when the input voltage is higher than
VSS and to “0” when it is lower than VSS. The input signal to P45/
INT1/ZCR pin can select to either pass through the zero cross de-
tection comparator or not to do.
When using 100 V AC as input signal, insert an external circuit be-
tween it and P45/INT1/ZCR pin. Set the input current limiting
resistors used in the external circuit to a value which satisfies the
absolute maximum rating of port P45.
Fig. JE-1 External circuit example for zero cross detection
Fig. JE-3 Block diagram of zero cross detection circuit
Fig. JE-2 Structure of zero cross detection control register
VCC
R1
R2
P45/INT1/ZCR
VSS
100V AC
Zero cross detection ON/OFF selection bit
0 : Without passing through zero cross detection comparator
1 : Passing through zero cross detection comparator
Not used (returns “0” when read)
Noise filter sampling clock selection bits (INT1)
b3 b2
0 0 : Not use noise filter
0 1 : f(XIN)/64 or f(XCIN)/64
1 0 : f(XIN)/128 or f(XCIN)/128
1 1 : f(XIN)/256 or f(XCIN)/256
One-sided/both-sided edge detection selection bit
0 : One-sided edge detection
1 : Both-sided edge detection
Not used (return “0” when read)
Zero cross detection circuit input bit (read only)
0 : Less than 0 V
1 : 0 V or more
b7
Zero cross detection control register
(ZCRCON : address 003916)
b0
P45/INT1/ZCR
Zero cross detection
ON/OFF selection bit
“0”
“1”
Zero cross detection
circuit input bit
Rising/falling
edge switch
Noise filter
When not using
the filter
When using
the filter
INT1/ZCR
interrupt request
One-sided/both-sided edge
detection selection bit
Noise filter sampling clock
selection bit
Zero cross detection comparator
f(XCIN)
f(XIN)
Divider
1/64
1/256
1/28
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