Cypress S6J3200 Series, Manual

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CHAPTER 26:PCMPWM
S6J3200 Series Hardware Manual Document Number: 002-04852 Rev. *G 993
[bit1] SILENCE : Silence Module Trigger
This bit triggers the Silence Mode of the PCMPWM module. Reading of this bit returns always 0.
Writing 1 enables the Silence Mode, writing 0 has no effect. Since this bit is in the same byte as the EN
bit and writing to SILENCE has only sense if the module is enabled, EN = 1 needs to be written at the
same time as SILENCE is written.
Bit Description
0 No change
1 Enable Silence Mode
[bit0] EN : PCMPWM Module Enable
This bit globally enables or disables the PCMPWM module. This bit must not be set before the
module's configuration has been completed. After the module has been enabled via this bit and the
PCM sample data FIFO buffer has been prefilled, the PCM to PWM conversion starts immediately. If
the FIFO buffer is empty when the module gets enabled, silence is driven on the PWM outputs and the
PCM to PWM conversion starts as soon as there are equal or less than PCMPWMi_CONTROL:FEST
empty spaces in the FIFO. The conversion counter is always restarted from zero when the module gets
enabled via this bit.
If the module's configuration is changed while this bit is set, i.e. the PCM to PWM conversion is
ongoing; the changes take effect immediately and may lead to audible noise. Depending on the type of
changes the reprogramming may also cause misbehavior on the module's other hardware interfaces.
E.g. the DMA transfer protocol may be violated and thus a DMA error condition might be caused.
Bit Description
0
PCMPWM is disabled; if the module is switched off via this bit, the PWM output stops immediately and
the outputs are set to their inactive values; no interrupts and DMA transfers can be requested
1 PCMPWM is enabled