PCD3330-1 Datasheet, PDF (18/32 Pages) NXP Semiconductors – Multistandard repertory dialler/ringer with EEPROM

Philips Semiconductors
Multistandard repertory dialler/ringer with
EEPROM
Product specification
PCD3330-1
5.5.7 MUTE FUNCTION (M-KEY)
When no dialling or programming is active, every time this
M-key is pressed the MUTE output goes to the active or
inactive state depending on its previous status.
When the MUTE output is in the active state and another
key is pressed then the MUTE output is switched back to
the inactive state.
When there is the on-hook dialling is not selected and the
Microphone mute flag in EEPROM is HIGH, every press
off the M-key will result in the inverted value of the
RVOL2/LSE output. At off-hook the status of this output is
HIGH.
5.5.8 ON-HOOK DIALLING CONTROL
If required, the on-hook dialling control feature can be
selected by programming the corresponding bit in
EEPROM.
When this on-hook dialling feature is selected, the power
supply to the PCD3330-1 must be maintained during
on-hook.
In telephone sets developed for on-hook dialling
(an electronic hook-switch must be present) activation of
the HOOK-key during on-hook results in an off-hook via
the DP/FL output, and the LSE output becomes HIGH.
As long as the handset stays on the cradle a new
activation of the HOOK-key results in an on-hook, and the
LSE output becomes LOW.
When during on-hook dialling the handset is lifted from the
cradle the on-hook dialling mode is switched off and the
LSE output is set to the active (LOW) state.
When the handset is off-hook (not on the cradle) activation
of this HOOK-key switches the loudspeaker on
(LSE = HIGH) or off (LSE = LOW) (listening-in feature).
5.6 Number storage, transmission and redial
5.6.1 NUMBER STORAGE AND TRANSMISSION
If the first key pressed at off-hook is 0 to 9 in pulse dialling
or 0 to 9, ∗ and # in DTMF dialling mode, digits are entered
into the work register and compared with the previous
entries stored in the redial register. As long as the newly
dialled digits are equal to those stored, the contents of the
redial register are unaffected.
When the newly pressed digit is different from the one
stored in the redial register the contents of the work
register are copied to the redial register when going
on-hook (or every other action equal to on-hook).
Up to 24 digits can be stored in the redial register. After the
work register overflows, a 10 digits First-In-First-Out
register (FIFO) takes over as buffer and the contents of the
work register is now copied to the redial register.
After transmitting the first digit of the FIFO register this
position is automatically cleared to provide space for the
storage of new data. In this way, the total number that can
be transmitted is unlimited, provided the key-in rate is not
excessive. However, if the FIFO register overflows (more
than 10 digits in store) further input is ignored.
Input digits are transmitted immediately with minimum
transmission time. Transmission continues for as long as
digits are input.
5.6.2 LAST NUMBER REDIAL (1 TO 24 DIGITS)
If the first key pressed and released is LNR, the stored
number in the redial register is recalled and transmitted
immediately.
The LNR key can be used in two other ways, known as the
‘cursor’ method and the ‘Atlanta’ procedure, to allow
external numbers to be redialled from a PABX with an
appropriate access pause.
5.6.3 ACCESS PAUSE BY CURSOR METHOD
If the first key entered is not LNR but numerical digits,
these digits are compared to those held in store. As long
as the digits entered equal those stored, the redial register
in not cleared and dialling can be continued by pressing
the redial key. The already dialled part is not redialled.
Redial is inhibited as soon an entry is unequal to the digit
at the same position held in store.
This ‘cursor’ method allows an access code to be entered
and access confirmation tone to be received before an
external number is redialled.
5.6.4 ACCESS PAUSE BY ATLANTA PROCEDURE
If the first key entered is the redial key, but this key is kept
down, then only the first digit held in the redial register is
transmitted. After releasing the redial key the remaining
digits held in the redial register are dialled.
The ‘Atlanta’ procedure allows a single stored access digit
to be transmitted, but redial of the external number to be
delayed until access has been confirmed.
5.6.5 10-NUMBER REPERTORY DIALLING
The PCD3330-1 includes a 10-number repertory dialler,
16 or 20 digits each, which is accessible with a one or
two-key procedure.
1997 Jan 15
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