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SSI73K212LBell 212A/1 03Single-Chip ModemCONTROL REGISTER 107 06TRANSMIT TRANSMITCR1 PATTERN PATTERN001 1 005ENABLEDETECTINTER.04 03 02 01 DOBYPASS ClK RESET TEST TESTSCRAMB CONTROL MODE MODE1 0BIT NO. NAME CONDITION01 DO01, DO Test Mode 0 00 11 01 102 Reset 003 ClK Control 0(Clock Control)04 Bypass 0Scrambler05 Enable Detect 0Interrupt1111DESCRIPTIONSelects normal operating mode.Analog loopback mode. loops the transmitted analogsignal back to the receiver, and causes the receiver touse the same center frequency as the transmitter. Tosquelch the TXA pin. transmit enable bit must be low.Selects remote digital loopback. Received data islooped back to transmit data internally, and RXO isforced to a mark. Data on TXO is ignored.Selects local digital loopback. Internally loops TXOback to RXO and continues to transmit data carrier atthe TXA pin.Selects normal operation.Resets modem to power down state. All control registerbits (CRO, CR1. Tone) are reset to zero. The outputof the ClK pin will be set to the crystal frequency onreset.Selects 11.0592 MHz crystal echo output at ClK pin.Selects 16 X the data rate. output at ClK pin in OPSKmodes only.Selects normal operation. OPSK transmn data is passedthrough scrambler.Selects Scrambler Bypass. Bypass OPSK data isrouted around scrambler in the t~ansmit path.--Disables interrupt at INT pin.Enables INT output. An interrupts will be generatedwith a change in status of DR bits 01-04. The answertone and call progress detect interrupts are maskedwhen the TX enable bit is set. Carrier detect is maskedwhen TX OTMF is activated. All interrupts will bedisabled if the device is in power down mode.3-10