MT88L89AC MITEL [Mitel Networks Corporation], MT88L89AC Datasheet - Page 10

• Manufacturer Part Number: MT88L89AC
• Description: 3V Integrated DTMFTransceiver with Adaptive Micro Interface
• Manufacturer: MITEL [Mitel Networks Corporation]

MT88L89
4-134
RS0
BIT
b0
b1
b2
b3
0
0
1
1
RSEL
C/R
b3
b3
Motorola
Table 3. Internal Register Functions
CP/DTMF
R/W
NAME
TOUT
RSEL
0
1
0
1
IRQ
Table 4. CRA Bit Positions
Table 5. CRB Bit Positions
S/D
IRQ
b2
b2
WR
0
1
0
1
Intel
Tone Output Control. A logic high enables the tone output; a logic low turns the tone output
off. This bit controls all transmit tone functions.
Call Progress or DTMF Mode Select. A logic high enables the receive call progress mode;
a logic low enables DTMF mode. In DTMF mode the device is capable of receiving and
transmitting DTMF signals. In CP mode a retangular wave representation of the received
tone signal will be present on the IRQ/CP output pin if IRQ has been enabled (control
register A, b2=1). In order to be detected, CP signals must be within the bandwidth
specified in the AC Electrical Characteristics for Call Progress.
Note: DTMF signals cannot be detected when CP mode is selected.
Interrupt Enable. A logic high enables the interrupt function; a logic low de-activates the
interrupt function. When IRQ is enabled and DTMF mode is selected (control register A,
b1=0), the IRQ/CP output pin will go low when either 1) a valid DTMF signal has been
received for a valid guard time duration, or 2) the transmitter is ready for more data (burst
mode only).
Register Select. A logic high selects control register B for the next write cycle to the
control register address. After writing to control register B, the following control register
write cycle will be directed to control register A.
RD
1
0
1
0
CP/DTMF
TEST
Write to Transmit
Data Register
Read from Receive
Data Register
Write to Control Register
Read from Status Register
b1
b1
Table 6. Control Register A Description
FUNCTION
ENABLE
BURST
TOUT
b0
b0
DESCRIPTION
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