73K221AL datasheet(10/26 Pages) TDK

10 / 26 page

73K222BL

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

Single-Chip Modem with Integrated Hybrid

CONTROL REGISTER 0 (continued)

CR0

000

MODUL.

OPTION

TRANSMIT

MODE 3

TRANSMIT

MODE 2

TRANSMIT

MODE 1

TRANSMIT

MODE 0

TRANSMIT

ENABLE

ANSWER/

ORIGINATE

BIT NO.

NAME

CONDITION

DESCRIPTION

Selects:

DPSK mode at 1200 bit/s.

DPSK mode at 600 bit/s.

FSK Bell 103 mode.

FSK CCITT V.21 mode.

Modulation

Option

X = Don’t care

CONTROL REGISTER 1

CR1

001

TRANSMIT

PATTERN

TRANSMIT

PATTERN

ENABLE

DETECT

INTER.

BYPASS

SCRAMB

CLK

CONTROL

RESET

TEST

MODE

TEST

MODE

BIT NO.

NAME

CONDITION

DESCRIPTION

Selects normal operating mode

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.

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

Selects local digital loopback. Internally loops TXD

back to RXD and continues to transmit carrier from

TXA pin.

Selects normal operation.

Reset

Resets

modem

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.

Selects 11.0592 MHz crystal echo output at CLK pin.

CLK Control

(Clock Control)

Selects 16 times the data rate, output at CLK pin in

DPSK modes only.

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