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73K224BL-IH Datasheet(PDF) 4 Page - List of Unclassifed Manufacturers |
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73K224BL-IH Datasheet(HTML) 4 Page - List of Unclassifed Manufacturers |
4 / 33 page 73K224BL V.22bis/V.22/V.21/Bell 212A/103 Single-Chip Modem w/ Integrated Hybrid 4 SERIAL CONTROL INTERFACE MODE The serial Command mode allows access to the 73K224BL control and status registers via a serial control port. In this mode the AD0, AD1, and AD2 lines provide register addresses for data passed through the AD7 (DATA) pin under control of the RD and WR lines. A read operation is initiated when the RD line is taken low. The next eight cycles of EXCLK will then transfer out eight bits of the selected address location LSB first. A write takes place by shifting in eight bits of data LSB first for eight consecutive cycles of EXCLK. WR is then pulsed low and data transfer into the selected register occurs on the rising edge of WR. DTMF GENERATOR The DTMF generator controls the sending of the sixteen standard DTMF tone pairs. The tone pair sent is determined by selecting transmit DTMF (bit D4) and the 4 DTMF bits (D0-D3) of the Tone Register. Transmission of DTMF tones from TXA is gated by the transmit enable bit of CR0 (bit D1) as with all other analog signals. |
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