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21 HW Processor (HWP) and Sound Output
When the playback output is resumed, a smoothing (fade-in) process for the playback output signal is car-
ried out to suppress the occurrence of noise due to a sudden rise of the signal. (See Figure 21.4.1.4.)
Terminating playback
In the playback state (sp_state_play), pause state (sp_state_pause), and mute state (sp_state_mute), the play-
back can be terminated to return the state to the idle state (sp_state_idle) with the procedure shown below.
1. Confirm that the STATE_n.STATE[15:0] bits = 0x0002 (sp_state_play), 0x0003 (sp_state_pause), or
0x0004 (sp_state_mute).
2. Confirm that the STATUS.READY bit = 1.
3. Set the COMMAND_n.COMMAND[7:0] bits to 0x02 or 0x03.*
4. Write 1 to the HWPCMDTRG.HWP0TRG bit.
5. Wait until the HWPINTF.HWP0IF bit is set to 1 (interrupt).
The HWP enters the idle state at this point.
6. Confirm that the STATE_n.STATE[15:0] bits = 0x0001 (sp_state_idle) as necessary.
7. Write 0 to the HWPINTF.HWP0IF bit.
* Two playback terminate commands are available. Setting the COMMAND_n.COMMAND[7:0] bits to 0x02
selects the Sound Stop Immediately command; setting to 0x03 selects the Sound Stop after Current Phrase
command.
Sound Stop Immediately command
When this command is issued by the trigger bit, the playback output is terminated immediately. At this
time, a smoothing (fade-out) process for the playback output signal is carried out to suppress the occurrence
of noise. (See Figure 21.4.1.2.)
Sound Stop after Current Phrase command
The playback output is terminated after ending the phrase that is being output when the command is issued.
(See Figure 21.4.1.3.)
In the pause or mute state, the playback is terminated by releasing the pause or mute state immediately re-
gardless of which of the Sound Stop commands is issued.
Sound play error
When an error occurs during processing of the sound play function, the HWPINTF.HWP1IF bit is set to 1 (an
interrupt can be generated). The error contents can be confirmed by reading the ERROR.ERROR[15:0] bits. As
shown in Table 21.4.1.2, the ERROR.ERRORx bit corresponding to the error that has occurred is set to 1.
ERROR.ERROR[15:0] bits
0000 0000 0000 0000
Non-fatal error
xxxx xxxx xxxx xxx1 (bit 0)
xxxx xxxx xxxx xx1x (bit 1)
xxxx xxxx xxxx x1xx (bit 2)
xxxx xxxx xxxx 1xxx (bit 3)
xxxx xxxx 1xxx xxxx (bit 7)
Fatal error
xxxx xxx1 xxxx xxxx (bit 8)
xxxx xx1x xxxx xxxx (bit 9)
xxx1 xxxx xxxx xxxx (bit 12) error_rom_data_mount The sound data ROM cannot be accessed.
x1xx xxxx xxxx xxxx (bit 14) error_function_id
1xxx xxxx xxxx xxxx (bit 15) error_others
When a non-fatal error has occurred, reissue a valid command.
When a fatal error has occurred, remove the cause of error and redo the processing from initialization.
21-12
Table 21.4.1.2 List of Sound Play Errors
Error
error_no_error
No error has occurred.
error_ch0_command
A command that is undefined or is ineffective in the cur-
rent state has been specified in Ch.0.
error_ch1_command
A command that is undefined or is ineffective in the cur-
rent state has been specified in Ch.1.
error_ch0_sentence_no An invalid sentence number has been specified in Ch.0.
error_ch1_sentence_no An invalid sentence number has been specified in Ch.1.
error_sdac_overflow
An overflow has occurred in the SDAC output signal.
error_ch0_decode
Invalid sound data has been read in Ch.0.
error_ch1_decode
Invalid sound data has been read in Ch.1.
An undefined function ID has been specified.
Another error has occurred.
Seiko Epson Corporation
(Command acceptable)
(Select Sound Stop command)
(Trigger to issue command)
(Occurrence of state transition)
(Clear interrupt flag)
Meaning
S1C31D50/D51 TECHNICAL MANUAL
(Rev. 2.00)
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