NSAM265SR Datasheet, PDF(25/58 Page) National Semiconductor (TI)

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NSAM265SR Datasheet, PDF (25/58 Pages) National Semiconductor (TI) – CompactSPEECH Digital Speech Processors

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3 0 Command Set (Continued)

DTMF

RESET

VOX

Reserved EV

MEMLOW DIALTONE BUSY

ERROR

MEMFULL NORMAL

END

DTMF

END

DTMF

DIGIT

GNM

Get Number of Messages tag ref tag mask

NSAM265SR

NSAM265SF

Returns the number of messages whose message tags

match the tag ref parameter Only bits set in tag mask

are compared i e a match is considered successful if

message tag and tag mask e tag ref and tag mask

where and is a bitwise AND operation

The tag ref and tag mask parameters are each two

bytes the return value is also 2-byte long

For example if tag ref e 4216 and tag mask e 3F16

the number of existing old messages whose user-defined

tag is 2 is returned See Section 1 5 for a description of

message tag encoding If tag mask e 0 the total number

of all existing messages is returned regardless of the tag

ref value

GSW

Get Status Word

NSAM265SR

NSAM265SF

Returns the 2-byte status word

The Status Word

The CompactSPEECH processor has a 16-bit status word

to indicate events that occur during normal operation The

CompactSPEECH sets the MWRQST signal to active (low)

to indicate a change in the status word This signal remains

active until the CompactSPEECH receives a GSW com-

mand

The status word is cleared during reset and by the GSW

command

The bits in the status word are used as follows

EV DTMF DIGIT

DTMF digit A value indicating a detected DTMF digit (See

GT command )

EV DTMF END

1 e Ended detection of a DTMF tone The detected digit is

held in EV DTMF DIGlT

EV NORMAL END

1 e Normal completion of operation e g end of message

playback end of garbage collection etc

EV MEMFULL

1 e Memory is full

EV ERROR

1 e Error detected in the last command You can use the

GEW command to return the error code

EV BUSY

1 e Busy tone detected Use this indicator for call progress

and line disconnection

EV DIALTONE

1 e Dial tone detected Use this indicator for call progress

and line disconnection

EV MEMLOW

NSAM265SF only 1 e Memory is almost full (i e 20 sec-

onds recording time remain assuming no silence on the

one-before-last FLASH block) when working in memory in-

tensive mode

EV VOX

1 e a period of silence (no energy) was detected on the

telephone line during recording

EV RESET

When the CompactSPEECH completes its power-up se-

quence and enters the RESET state this bit is set to 1 and

the MWRQST signal is activated (set low) Normally this bit

changes to 0 after performing the INIT command If this bit

is set during normal opertion of CompactSPEECH it indi-

cates an internal CompactSPEECH error The microcontrol-

ler can recover from such an error by reinitializing the sys-

tem

EV DTMF

1 e Started detection of a DTMF tone

Generate Tone tone

NSAM265SR

NSAM265SF

Generates the tone specified by the 1-byte tone parameter

until an S command is received

Specify the tone by setting the bits of tone as follows

Bit 0

Bits 1 â 4 DTMF code

Where the DTMF code is encoded as follows

Value (Hex)

DTMF Digit

0 to 9

Bits 5 â 7 0

To generate a single-frequency tone encode the bits as fol-

lows

Bit 0

Bits 1 â 5 3 â 20

The value in bits 1 â 5 is multiplied by 100 to

generate the required frequency (300 Hz

through 2000 Hz)

Bits 6 7 0

CompactSPEECH does not check the validity of the tone

specification Invalid specifications yields unpredictable re-

sults

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