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BU8307CS Datasheet(PDF) 8 Page - Rohm |
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BU8307CS Datasheet(HTML) 8 Page - Rohm |
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8 / 17 page  170 Communication ICs BU8307CS / BU8307CF Key operations ": Off-hook #: On-hook (1) Normal dialing "D1 to Dn After going off-hook, the dial data from the key input is written to the redial memory, and the dial signals are sent based on the specified mode (pulse or tone). There is no upper limit on the number of digits that can be dialed. Key input can also be entered during dial output. To inhibit subsequent redialing, press the R key twice after the dial signals have been sent. (2) Access pause "D1 PA D2 to Dn Pressing the PA key automatically initiates a 3.6-second pause. Pauses can be stacked by simply pressing the PA key the required number of times, each time being one 3.6-second pause. During a pause, dialing input is allowed,just as during dial signal transmission. When redialing, if a pause is being executed, it can be canceled by pressing the PA , T , or R key during the pause. Multiple causes being executed in succession can also be canceled by pressing the PA , T , or R key one time during the cumulative pause. (3) Redial " R " # (MODEIN = H or Z) Redial is only accepted if the redial key is pressed im- mediately after going off-hook. After going off-hook, pressing the R key in tone mode or the # key in pulse mode causes the last number dialed to be redialed. Key input is not accepted when a redial signal is being output. After the redial digits have been transmitted, any number of valid key inputs are accepted and transmitted. The re- dial memory holds up to 32 digits. Redial is inhibited if more than 32 digits are dialed in pulse mode, or more than 31 digits are dialed in tone mode. In pulse mode, the following can be written to the redial memory : 0 to 9 , PA and T . In tone mode, the following can be written to the redial memory 0 to 9 , , # , and PA . Further redialing is inhibited following completion of the redial output by pressing the R key twice in succession. Note: In tone mode, because one digit of memory is used to store the mode, the maximum number of valid digits available for redialing is 31. (4) Mode switching (mixed mode dialing) "D1 to Di T (or ) Di+1 to Dn (MODEIN = H or Z) Switching from pulse mode to tone mode can be done only once when in an off-hook state. Setting the mode switching pin to the pulse mode (MODEIN = HIGH or Z) and pressing the T (or ) key writes the data required to switch to tone mode into memory. In pulse mode, pressing the T (or ) key while the dial signal is being sent automatically inserts a 3.6-second pause after all digits up to that key have been trans- mitted, and all subsequent dial signals are transmitted as tones. In this case, the signal is sent out as a DTMF signal. Also, because the information required to switch to the tone mode is written to the memory, mixed dialing is possible when redialing. When doing this, the mode setting will match that at the time of key input, regardless of the position of the MODEIN pin. (5) Hooking " H This initiates the hooking operation. After the operation has been completed, a hooking pause is inserted auto- matically. If a dial signal is being transmitted when the H key is pressed, the dial sequence is immediately inter- rupted, and the hooking operation is initiated. The hook- ing time can be selected as either 607ms or 84ms, de- pending on the setting of the LH / SH pin. Pressing the H key initiates the following sequence: off-hook ! on-hook (hooking time) ! off-hook pause (hooking pause time) ! off-hook operation. Internal state of the IC when the H key is pressed 1 The input mode is reset, and the circuit goes to stand- by state in the pulse mode. If the MODEIN pin is LOW, however, the state is recog- nized as tone mode. 2 The line pointer is reset, enabling redialing. 3 After the H key has been pressed, other subsequent key input is enabled. The hooking operation is not written to the memory. While the hooking operation is in prog- ress, the only key input which is not accepted is the H key. All other key input is accepted. |
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