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73K222BL Datasheet(PDF) 10 Page - TDK Electronics |
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73K222BL Datasheet(HTML) 10 Page - TDK Electronics |
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10 / 26 page  73K222BL V.22, V.21, Bell 212A, Bell 103 Single-Chip Modem with Integrated Hybrid 10 CONTROL REGISTER 0 (continued) D7 D6 D5 D4 D3 D2 D1 D0 CR0 000 MODUL. OPTION 0 TRANSMIT MODE 3 TRANSMIT MODE 2 TRANSMIT MODE 1 TRANSMIT MODE 0 TRANSMIT ENABLE ANSWER/ ORIGINATE BIT NO. NAME CONDITION DESCRIPTION D7 D5 D4 Selects: 0 0 X DPSK mode at 1200 bit/s. 1 0 X DPSK mode at 600 bit/s. 0 1 1 FSK Bell 103 mode. 1 1 1 FSK CCITT V.21 mode. D7 Modulation Option X = Don’t care CONTROL REGISTER 1 D7 D6 D5 D4 D3 D2 D1 D0 CR1 001 TRANSMIT PATTERN 1 TRANSMIT PATTERN 0 ENABLE DETECT INTER. BYPASS SCRAMB CLK CONTROL RESET TEST MODE 1 TEST MODE 0 BIT NO. NAME CONDITION DESCRIPTION D1 D0 00 Selects normal operating mode 0 1 Analog loopback mode. Loops the transmitted analog signal back to the receiver, and causes the receiver to use the same center frequency as the transmitter. To squelch the TXA pin, transmit enable must be forced low. 10 Selects remote digital loopback. Received data is looped back to transmit data internally, and RXD is forced to a mark. Data on TXD is ignored. D1, D0 Test Mode 11 Selects local digital loopback. Internally loops TXD back to RXD and continues to transmit carrier from TXA pin. 0 Selects normal operation. D2 Reset 1 Resets modem to power-down state. All control register bits (CR0, CR1, TONE) are reset to zero. The output of the CLK pin will be set to the crystal frequency. This bit clears itself. 0 Selects 11.0592 MHz crystal echo output at CLK pin. D3 CLK Control (Clock Control) 1 Selects 16 times the data rate, output at CLK pin in DPSK modes only. |
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