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PDF PCD3310A Data sheet ( Hoja de datos )
| Número de pieza | PCD3310A | |
| Descripción | Pulse and DTMF diallers with redial | |
| Fabricantes | NXP Semiconductors | |
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INTEGRATED CIRCUITS
DATA SHEET
PCD3310; PCD3310A
Pulse and DTMF diallers with redial
Product specification
Supersedes data of 1996 May 06
File under Integrated Circuits, IC03
1996 Nov 21
1 page  
Philips Semiconductors
Pulse and DTMF diallers with redial
5 BLOCK DIAGRAM
Product specification
PCD3310; PCD3310A
handbook, full pagewidth
1996 Nov 21
5
5 Page 
Philips Semiconductors
Pulse and DTMF diallers with redial
Product specification
PCD3310; PCD3310A
8.2 Redialling
After CE has risen to VDD the oscillator starts running.
The address of the first digit in the redial register is stored
in the RAC, and the device is in the conversation mode.
If ‘R’ is the first keyboard entry the device starts redialling
the contents of the temporary register. If the overflow flag
of the TWAC was set in the previous dialling, the redialling
continues in the main register.
Because access to an external line from a PABX usually
involves dialling an access code and waiting for an access
tone, a ‘one-press’ redial may fail due to insufficient delay
between the access code and the external number.
For this reason, the access code should be redialled. If the
access code (up to 4 digits) matches the first part of the
stored number, then pressing R after the access tone is
obtained will cause the rest of the number to be redialled
(see Fig.7, PABX).
Timing in the DTMF mode is calibrated for both tone bursts
and pauses.
In mixed mode only the first part entered (the pulse dialled
part of the stored number) can be redialled.
During redial keyboard entries (function or non-function)
are not accepted until the device returns to the
conversation mode after completion of redialling. No redial
activity takes place if one of the following events occur:
• Power-on reset
• Memory clear (‘P’ without subsequent data entry)
• Memory overflow (more than 23 valid data entries).
8.3 Notepad
The redial register can also be used as a notepad. In the
conversation mode a number with up to 23 digits can be
entered and stored for redialling. By activating the program
key (P) the WAC and TWAC pointers are reset. This acts
like a memory clear (redial is inhibited). Afterwards, by
entering and storing any digits, redialling will be possible
after flash or hook-on and hook-off (see Fig.9).
During notepad programming the numbers entered will not
be transmitted nor is the mute active, only the confidence
tone is generated.
handbook, full pagewidth
23
addressed
through pointers
WAC or RAC
6
5
4
3
2
1
MAIN REGISTER
addressed
through pointers
TWAC or RAC
5
4
3
2
1
TEMPORARY REGISTER
write address counter (WAC)
read address counter (RAC)
ADDRESS COUNTER
TEMPORARY WRITE
ADDRESS COUNTER (TWAC)
MGE493
Fig.6 Program memory map.
1996 Nov 21
11
11 Page | ||
| Páginas | Total 28 Páginas | |
| PDF Descargar | [ Datasheet PCD3310A.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| PCD3310 | Pulse and DTMF diallers with redial | NXP Semiconductors |
| PCD3310A | Pulse and DTMF diallers with redial | NXP Semiconductors |
| PCD3310AP | Pulse and DTMF diallers with redial | NXP Semiconductors |
| PCD3310AT | Pulse and DTMF diallers with redial | NXP Semiconductors |
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