AS2533F datasheet(7/25 Pages) AMSCO

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Data Sheet AS2533-36

austriamicrosystems

Last Number Redial

LNR is a facility that allows resignalling of the last

manually dialed number without keying in all the digits

again. The LNR is repeatable after each off-hook.

The current content of the RAM is overwritten by new

entries.

A manually entered number is automatically stored in the

LNR RAM. The capacity of the RAM is 31 digits. If a

number greater than 31 digits is entered, the LNR facility

will be inhibited (until new entries < 32 digits) and further

entries will be buffered in FIFO.

Pauses can be inserted by pressing the PS key (not

AS2535).

Post dialed digits, i.e. digits manually entered after LNR

has been invoked, are not stored in RAM but buffered in

FIFO.

Repeat Dialing (not AS2535)

The last manually dialed number can be repeated without

going on-hook by pressing the RP key. If a called number

is engaged, pressing the RP key will break the line for 1.6

second (to get a new dial tone) and after a pause the

number will be repeated.

The repeat function is enabled when prior to pressing the

RP key, a number has been dialed, and it can be invoked

an unlimited number of times until next on-hook. During the

1.6 second break the device is in power down mode to

save current.

Recall Function

A recall (R1, R2 or R3 key) activation will invoke a flash

(timed loop break), however, the R1 flash is never

executed in LD mode. R2 and R3 will be executed

independent of the mode.

If recall is the first entry in a digit string, it will be stored in

LNR RAM when digit(s) are entered after the recall.

If the recall key is depressed after a digit string has been

entered or dialed out, the recall will not be stored but

buffered in the FIFO together with subsequently entered

digit.

If pressing the recall key is not followed by digit entries,

the LNR RAM remains intact.

After a recall a 270 ms pause will automatically be

Memory Keys (not AS2534)

The keys M1 to M12 are direct memory access keys and

the MR key (AS2533/36 only) is used for abbreviated

dialing.

Memory arrangement

AS2533/36 AS2534

AS2535

Storable numbers

Direct memory keys

Indirect memories

In the on chip RAM, numbers can be stored. Each number

can contain up to 21 digits (including pauses).

During programming multiple pauses can be inserted by

pressing the PS (not AS2535) or the LNR key. Each pause

inserted within the first 5 entries will automatically be

terminated after 2 seconds whereas pauses inserted after

location 5 in a digit string will halt dialing and can be

terminated manually by pressing the PS (not AS2535) or

the LNR key. The halt function allows in-dialing to an

extension on a PABX.

Example (45678–123 is stored in M1, where – is a

pause/wait and 123 the extension number):

off-hook, wait for dial tone

press M1 (45678 is dialed out)

await dial tone from called PABX

press PS or LNR (123 is dialed out)

Memory dialing is cascadable. However, the content of one

memory must be dialed out before a new can be invoked.

Sliding Cursor Procedure

To accommodate easy and uncomplicated redialing (LNR)

behind a PABX, a sliding cursor protocol is implemented. If

new entries match the previous RAM contents, pressing

the LNR key will dial out the remaining digits.

If there is an error in matching, the LNR will be inhibited

until next on-hook, and the RAM will contain the new

number.

Example (LNR content 912345, where 9 is access code):

off-hook, wait for PABX dial tone

press 9 and wait for external dial tone

press LNR (12345 will be dialed out).

Tone Generator

The tone generator incorporates the DTMF tones, 3 basic

frequencies for the tone ringer and pacifier tones.

DTMF

The DTMF generator provides 8 frequencies, namely:

Revision 8.8

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