NSAM266SAASLASHV datasheet(36/52 Pages) NSC

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20 Software (Continued)

GSW

Get Status Word

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 asserts the MWRQST signal (clears to 0)

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

1211

The bits in the status word are used as follows

DTMF

DIGIT

DTMF digit A value indicating a detected DTMF digit (See

the description of DTMF code in the GT command)

DTMF

END

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

held in EV

DTMF

DIGIT

NORMAL

END

1 e Normal completion of operation eg end of message

playback

MEMFULL

1 e Memory is full

ERROR

1 e Error detected in the last command You must issue

the GEW command to return the error code and clear

the error condition

BUSY

1 e Busy tone detected Use this indicator for call progress

and line disconnection

DIALTONE

1 e Dial tone detected Use this indicator for call progress

and line disconnection

VOX

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

telephone line during recording (See VOX

TIME

COUNT in Table 2-2)

RESET

When the CompactSPEECH completes its power-upse-

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

the MWRQST signal is activated (cleared to 0)

Normally this bit changes to 0 after performing the INIT

command If this bit is set during normal operation of the

CompactSPEECH it indicates an internal CompactSPEECH

error The microcontroIler can recover from such an error by

re-initializing the system

DTMF

1 e Started detection of a DTMF tone

Example

GSW

Byte sequence

Microcontroller

14 AA AA

CompactSPEECH 14 00 40

Description

Get the CompactSPEECH Status Word

(typically sent after the MMRQST signal

is asserted by the CompactSPEECH

which indicates a change in the status

word)

The CompactSPEECH responds that the

memory is full

Generate Tone

tone

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 – 4

DTMF code

Where the DTMF code is encoded as follows

Value (Hex)

DTMF Digit

0to9

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