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參數(shù)資料
| 型號(hào)： | LV737212M |
| 文件頁(yè)數(shù)： | 21/27頁(yè) |
| 文件大?。?/td> | 308K |
| 代理商： | LV737212M |
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10. Serial Input
The following control can be performed using serial input.
Keypad input replacement (except for user-defined keys)
Setting the status bits (e.g., setting the on-hook dialing mode on/off)
Reading out the content of dialing memory
Setting the output port on/off states (including the DTMF signal output)
Serial input format
— Set the SI/KEY input pin high. This causes all the keypad inputs to be pulled up and the C6 to C8 pins function as
serial input pins for an internal shift register.
C6 = Clock input
C7 = Data input
C8 = Strobe input
— Data is written on the falling edge of the clock input
— The period when the strobe input is low is equivalent to the period when a keypad key is pressed.
— The data consists of 8 bits.
— Codes other than the 40 codes defined as keypad keys are defined as input data codes in the serial input.
— This allows controls other than the DPR and BMR controls to be input serially.
No. 5203-21/27
LC737212, 737212M
D7
D6
D5
D4
D3
D2
D1
D0
D0
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