The ADC pins sense the front panel knobs, pitch bend wheel, master volume and battery condition. ![]() Yamaha designs typically sense the presence of AUX IN and PHONE connections, too. They also send data to the LCD panel via an LCD driver. The digital I/O pins sense the key and front panel switches and encoders. Serial I2S interface for incoming and outgoing digital audio.Low resolution analog-to-digital conversion (ADC).USB to Host interface (USB1.1 full speed).SH RISC instruction set architecture (ISA).This boost in spec is due to a new central processor, the SWX03: Newer entry-level keyboards, such as the Piaggero NP-32 and the PSR-EW410, have received a boost in polyphony (and DSP effects) over their respective predecessors. Polyphony is limited to 32 voices due to the relatively low memory transfer bandwidth between the SWL01 and flash memory. ![]() ![]() The embedded software program and sound waveform data (AKA “the samples”) are stored together in a single flash memory device. The SWL01 is a high volume LSI part which combines a microprocessor, tone generation and DSP resources into a single integrated circuit. Up until the last few years, Yamaha’s low-end keyboards were based around its proprietary SWL01 processor. Last August, I took an in-depth look at the internal design of Yamaha’s entry-level, low-cost keyboards.
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