XE0068DT(1999) View Datasheet(PDF) - Xecom

Part Name

Description

Manufacturer

XE0068DT
(Rev.:1999)

FCC Registered DAA Module with DTMF Transmitter/Decoder

Xecom 

XE0068DT Control Register A

Table 4 below defines the XE0068DT operations set by the bits in Control Register A.

Table 4 Bit

Signal Function

0

TOUT Tone Output Control: This bit controls the tone transmit functions. A

high enables the tone output; a low turns tone outputoff.

1

CP/DTMF Call Progress or DTMF Mode: A logic high enables the XE0068DT to

detect call progress tones. A low enables DTMF send and receive

mode. In call progress mod a square wavee representation of the

incoming signal will be presented on the CP output, IRQ enabled.

DTMF tones cannot be decoded in call progress mode.

2

IRQ

Interrupt Enaable: A logic high enables the interrupt function. When

IRQ and DTMF mode are disabled, the CP output will go low when

either a valid DTMF signal is received or the transmitter is ready for

more data.

3

RSEL Register Select. A logic high on bit 3 sets the XE0068DT to select

Control Register B for the next write cycle. After writing to Control

Register B, the next control register write cycle will be directed to

Control Register A.

XE0068DT Control Register B

Table 5 below defines the XE0068DT operations set by the bits in Control Register B.

Table 4 Bit

Signal Function

0

Burst Burst Mode: A logic low enables burst mode. When Burst Mode is

activated, DTMF tones can be transmitted by writing the correct code to

the Transmit Register. The XE0068DT the transmits a tone burst of 51

milliseconds on and 51 milliseconds off. In call progress mode the

duration of the tone burst and pause after the tone burst are doubled to

102 milliseconds. When not in Burst Mode the XE0068DT transmits

the tone as long as TOUT, Status Register A, is active.

1

Test

Test Mode: A logic high enables the Test Mode in teh XE0068DT.

When the Test and DTMF modes are selected, the signal on CP reflects

the state of the delayed steering bit of the status register.

2

S/D

Single or Dual Tone Generation: A logic high sets the XE0068DT to

generate a single tone rather than the transmiting two tones.

3

C/R

Column or Row: Control Register B bit 3 determines if the row or

column tone is transmitted when single tone operation is selected. A

logic high selects the trow tone output

XECOM

(6)

XE0068DT

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