參數(shù)資料
型號(hào)： MT88L85
廠商： Mitel Networks Corporation
英文描述： 3V Integrated DTMF Transceiver with Power-Down and Adaptive Micro Interface(3V 集成雙音多頻信號(hào)（DTMF）接收器（帶電源關(guān)閉和自適應(yīng)微接口）)
中文描述： 3V的集成雙音多頻收發(fā)器關(guān)閉電源和自適應(yīng)微型接口（3V的集成雙音多頻信號(hào)（DTMF）的接收器（帶電源關(guān)閉和自適應(yīng)微接口））
文件頁(yè)數(shù)： 11/25頁(yè)
文件大小： 197K
代理商： MT88L85
MT88L85
4-81
Table 7
.
Control Register B Description
Note 1: When both TOUT and RxEN are asserted to power-down, the crystal oscillator and the Vref circuits are powered down.
Table 8
.
Status Register Description
BIT
NAME
DESCRIPTION
b0
BURST
Burst Mode Select. A logic high de-activates burst mode; a logic low enables burst mode.
When activated, the digital code representing a DTMF signal (see Table 1) can be written
to the transmit register, which will result in a transmit DTMF tone burst and pause of equal
durations (typically 51 msec). Following the pause, the status register will be updated (b1 -
Transmit Data Register Empty), and an interrupt will occur if the interrupt mode has been
enabled.
When CP mode (Control Register A, b1) is enabled the normal tone burst and pause
durations are extended from a typical duration of 51 msec to 102 msec.
When BURST is high (de-activated) the transmit tone burst duration is determined by the
TOUT bit (Control Register A, b0).
b1
RxEN
This bit enables the DTMF and Call Progress Tone receivers. A logic low enables both
circuits. A logic high deactivates and puts both receiver circuits into power-down mode.
See Note 1 below.
b2
S/D
Single or Dual Tone Generation. A logic high selects the single tone output; a logic low
selects the dual tone (DTMF) output. The single tone generation function requires further
selection of either the row or column tones (low or high group) through the C/R bit (Control
Register B, b3).
b3
C/R
Column or Row Tone Select. A logic high selects a column tone output; a logic low selects
a row tone output. This function is used in conjunction with the S/D bit (Control Register B,
b2).
BIT
NAME
STATUS FLAG SET
STATUS FLAG CLEARED
b0
IRQ
Interrupt has occurred. Bit one
(b1) or bit two (b2) is set.
Interrupt is inactive. Cleared after
Status Register is read.
b1
TRANSMIT DATA
REGISTER EMPTY
(BURST MODE ONLY)
Pause duration has terminated
and transmitter is ready for new
data.
Cleared after Status Register is
read or when in non-burst mode.
b2
RECEIVE DATA REGISTER
FULL
Valid data is in the Receive Data
Register.
Cleared after Status Register is
read.
b3
DELAYED STEERING
Set upon the valid detection of
the absence of a DTMF signal.
Cleared upon the detection of a
valid DTMF signal.
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