XE2422H Просмотр технического описания (PDF) - Unspecified

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XE2422H

Low-Cost, 2400 BPS Surface-Mount Modem

Unspecified 

XE2422H REGISTER SETTINGS

SDB Line Voltage Status: SDB is a read only register that stores the value of the loop voltage in two’s

compliment form. The most significant bit, Bit 7, indicates the polarity of the voltage on Tip and

Ring.

Units 1 Volt

Default 00 (Tip and Ring Voltage less than 3 volts)

SE2 Interrupt Enable: SE2 activates the XE2422H Interrupt output. Default = 00

Bit # Definition

7:6: Interrupt Output Control

5:4 /DTR Control

3:2 /DCD

1:0 Reserved

Action

00 = Disabled *

01 = Disabled

10 = Disabled

11 = Interrupt Output Enabled

00 = Disabled *

01 = Disabled

10 = Disabled

11 = /DTR Enabled

00 = /DCD Disabled*

01 = /DCD Enabled

10 = /DCD Disabled

11 = /DCD Disabled

SF1 Power Down Register: SF1 allows the XE2422H to be placed in power down mode. The modem

draws only about 100 microamps in Power down mode. Default = 0C

Bit # Definition

Action

7 Reserved

6 Power Down Mode

0 = Normal Operation

1 = Power Down Selected

5:4 Reserved

3:2 Forced Active

1:0 Reserved

SF3 Loop Current Status: SF3 is a read only register that stores the current value of the loop current.

Units 1.1 Volt

Default 00 (no Loop Current Present)

XECOM

(17)

XE2422H

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