NSAM266SAASLASHV datasheet(34/52 Pages) NSC

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20 Software (Continued)

GEW

Get Error Word

Returns the 2-byte error word

THE ERROR WORD

The 16-bit error word indicates errors that occurred during

execution of the last command If an error is detected the

command is not processed the EV

ERROR bit in the

status word is set to 1 and the MWRQST signal is activated

(set to low)

The GEW command reads the error word The error word is

cleared during reset and after execution of the GEW com-

mand

If errors ERR

COMMAND or ERR

PARAM occur during

the execution of a command that has a return value the

return value is undefined The microcontroller must still read

the return value to ensure proper synchronization

15 – 9

The bits of the error word are used as follows

ERR

OPCODE

Illegal opcode The command opcode is not recognized by

the CompactSPEECH

ERR

COMMAND

Illegal command sequence The command is not legal in the

current state

ERR

PARAM

Illegal parameter The value of the parameter is out of

range or is not appropriate for the command

ERR

COMM

Microcontroller MICROWIRE communication error

ERR

TIMEOUT

Time-out error Depending on the CompactSPEECH’s state

more than 20 ms to 30 ms elapsed between the arrival of

two consecutive bytes (for commands that have parame-

ters)

ERR

INVALID

Command cannot be performed in current context

Example

GEW

Byte sequence

Microcontroller

1B AA AA

CompactSPEECH 1B 00 02

Description

Get the CompactSPEECH error word

(typically sent after GSW when EV

ERROR is reported in the status word)

The CompactSPEECH responds

ERR

OPCODE

Get Information

item

Returns the 16-bit value specified by

item from one of the

internal registers of the CompactSPEECH

item may be one of the following

0 The duration of the last detected DTMF tone in 10 ms

units The return value is meaningful only if DTMF de-

tection is enabled and the status word shows that a

DTMF tone was detected

1 The duration of the last detected busy tone in 10 ms

units

2 The energy level of the samples in the last 10 ms

3 The energy level of the samples in the last 10 ms that

are in the frequency range described in

Figure 2-1 The

return value is meaningful only if one of the tone detec-

tors is enabled (bits 01 of the detectors mask see the

description of SDET command)

The return value is unpredictable for any other value of

item

Example

GI 0

Byte sequence

Microcontroller

25 00 AA AA

CompactSPEECH 25 00 00 06

Description

Get the duration of the last detected

DTMF tone

The CompactSPEECH responds

60 ms

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