參數(shù)資料
型號(hào)： LV737212M
文件頁(yè)數(shù)： 17/27頁(yè)
文件大小： 308K
代理商： LV737212M
6. Monitor Mode
Falling edges on the ON-HOOK DIAL IN input switches the system between off-hook dialing mode and monitor
mode.
In monitor mode, the HOOK-CTL and SP-CTL pins output high levels.
It is not possible to hold when the system is in monitor mode.
to on-hook dialing mode.
7. Memory Store Function
Placing the receiver on-hook switches the system
On-hook (with the line disconnected) and off-hook (with the line connected, including on-hook dialing and monitor
modes) storing can be selected. The On/OFF-HOOK store pin is used for this selection.
Data is stored in memory in store mode. The following key sequences switch the system to store mode.
— On-hook (disconnected from the line) ... Pressing either the STORE or M key
— Off-hook (connected to the line) ... Pressing the STORE key
Data is written to a memory store buffer memory (16 digits) by keying in that dialing data. Key confirmation tones
(1036 Hz, 31 ms) are output from the K-TONE pin during this operation. Keyed data corresponding to a seventeenth
or later digit is ignored and the confirmation tone is not output for those digits.
Specifying the memory address copies the contents of the memory store buffer memory to the specified address and
completes the memory store operation. A memory store confirmation tone (2072 Hz, 279 ms) is output from the K-
TONE pin at this point.
The data at a given address can be deleted by switching to store mode and then specifying the address without
entering any dialing data.
8. Key Acquisition Modes
In these modes, the LC737212/M simply accepts key input and transmits the corresponding key code and status over
the serial interface. Data from the keypad is not written to the RD memory and dialing is not performed.
Standby key acquisition mode
— Pressing the 00 key when the SI/KEY pin is low, or entering a code value of 20 when the SI/KEY pin is high,
switches the LC737212/M between standby mode and standby key acquisition mode.
— If, and only if, on-hook memory storing is selected, pressing the STORE key will switch the system to on-hook
store mode.
Off-hook key acquisition mode, on-hook dialing key acquisition mode, and monitor key acquisition mode
— In modes that allow dial output, entering a code value of 20 over the serial interface will switch the LC737212/M
to the corresponding key acquisition mode.
— Even if the LC737212/M is in a key acquisition mode, dialing data entered over the serial interface will be dialed.
9. Serial Output
During key input and when the system's internal mode change, the LC737212/M outputs the corresponding status
data from the S-OUT pin. Values of 0 and 1 are expressed by the length of the period the n-channel open-drain
output pin is in the on state, and data is grouped in 4-bit units for output.
0 = 280 μs, 1 = 760 μs, inter-bit interval = 560 μs
Interval between 4-bit groups = 1440 μs
(In memory content readout mode only, the 4-bit group interval is 1520 μs.)
During Key Input
— This data consists of 16 bits, starting with a bit (always 0) that indicates that this data is key input data. The next 2
bits are dialing related data, then the next 5 bits indicated the LC737212/M internal status, and finally, the last 8
bits indicate the key data.
— The data for all key presses that were longer than 30 ms (the key bounce (chatter) exclusion time) are output. (For
example, data key presses when the system is in hold mode are not dialed, but are output from S-OUT as key data.)
No. 5203-17/27
LC737212, 737212M
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