73K224BL-IH/F データシートの表示（PDF） - Teridian Semiconductor Corporation

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73K224BL-IH/F

V.22bis, V.22, V.21, Bell 212A, 103 Single-Chip Modem w/ Integrated Hybrid

Teridian Semiconductor Corporation 

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.

73K224BL

V.22bis, V.22, V.21, Bell 212A, 103

Single-Chip Modem w/ Integrated Hybrid

DATA SHEET

Page: 4 of 33

© 2005, 2008 TERIDIAN Semiconductor Corporation

Rev 7.1

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