73K224L datasheet(6/32 Pages) TDK

Part #	73K224L

Description	V.22bis/V.22/V.21/ Bell 212A/Bell 103 Single-Chip Modem

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Manufacturer	TDK [TDK Electronics]

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73K224L

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

Single-Chip Modem

6

REGISTER DESCRIPTIONS

Eight 8-bit internal registers are accessible for control

and status monitoring. The registers are accessed in

read or write operations by addressing the A0, A1 and

A2 address lines in serial mode, or the AD0, AD1 and

AD2 lines in parallel mode. The address lines are

latched by ALE. Register CR0 controls the method by

which data is transferred over the phone line. CR1

controls the interface between the microprocessor and

the 73K224L internal state. DR is a detect register

which provides an indication of monitored modem

status conditions. TR, the tone control register,

controls the DTMF generator, answer and guard

tones and RXD output gate used in the modem

initial connect sequence. CR2 is the primary DSP

control

interface

and

CR3

controls

transmit

attenuation and receive gain adjustments. All

registers are read/write except for DR and ID

which are read only. Register control and status

bits are identified below:

REGISTER BIT SUMMARY

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