Cypress S6J3200 Series, Manual

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CHAPTER 19:Sound Waveform Generator
S6J3200 Series Hardware Manual Document Number: 002-04852 Rev. *G 465
3.5.
Continuous SWFG Sound Source Generation
Setting of the next sound source specification can be performed by starting sound source generation
using the procedure under 3.1, even if a previous sound source generation operation is in progress. After
setting is complete, sound source generation starts and the corresponding WGCHSTART bit is set to 1,
so generation of the next sound source starts as soon as generation of the current sound source is
complete.
Figure 3-2
---
Time
ISR: Interrupt software routine
HW: Hardware
The sound source
#n
The sound source
#n
The sound source
#n+1
Configuration of
a sound source in ISR
Generation of
a configured sound
source by HW operation
The sound source
#n-2
The sound source
#n-1
The sound source
#n-1
Notes:
−
Setting the next sound's sound source specifications after the previous sound source generation
is complete can cause an audible break in the sound. Consecutive sound generation that uses a
sound source generation complete interrupt as shown in Figure 3-2 is recommended.
−
Using fade in and fade out control between the previous generation and the current generation
when consecutively generating sound sources can cause an audible break in the sound. When
performing consecutive generation, application of fade in and fade out, control is recommended
only when setting initial and final sound source specifications.
−
The FLSEN should be configured as longer than RELEASE. Only when the final sound source of
consecutive sound generation is generated, RELEASE only performs and FSLEN is ignored in
generation time.