XE0068DT(1999) View Datasheet(PDF) - Xecom

Part Name

Description

Manufacturer

XE0068DT
(Rev.:1999)

FCC Registered DAA Module with DTMF Transmitter/Decoder

Xecom 

XE0068DT Register Selection

Table 1 below shows the combination of RS0, /WR, and /RD to select each register.

Table 1

RS0

/WR

/RD

Function

0

0

1

Write to Transmit Data Register

0

1

0

Read from Receive Data Register

1

0

1

Write to Control Register A or B

1

1

0

Read from Status Register

DTMF Codes

Table 2 below shows the 4-bit codes applied to D0-D3 to represent each DTMF Digit.

Table 1

DTMF Digit 1 2 3 4 5 6 7 8 9 0 * # A B C D

D0

101010101010101 0

D1

011001100110011 0

D2

000111100001111 0

D3

000000011111111 0

XE0068DT Status Register

Table 3 below defines the bit codess which can be read from the status register.

Table 3

Bit

Indicator

Status Set

0

IRQ

An interrupt has occurred

1 Transmit Data Register

Empty

Transmitter Ready for

New Data

2 Receive Data Register

Full

3

Delayed Steering

ReceiveData Register

contains valid data

Set upon detection

of the absence of a

DTMF signal

Status Cleared

Interupt Active

Status has been read or

is in non-burst mode

Status Register has been

Read

Cleared upon detection of

a vailid DTMF signal

XECOM

(5)

XE0068DT

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