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Clock Control
– Built-in 48.0 MHz or 49.152 MHz selectable internal high speed RC oscillator (HIRC)
for system operation (Factory pre-trimmed to ±0.25% and variation < 2% at -40˚C ~
+85˚C)
– Built-in 10 kHz internal low speed RC oscillator (LIRC) for Watchdog Timer and wakeup operation
– 4~24 MHz external high speed crystal oscillator (HXT) for precise timing operation
– 32.768 kHz external low speed crystal oscillator (LXT) for RTC function and low-power
system operation
– Supports one PLL up to 500 MHz for high performance system operation, sourced
from HIRC or HXT
– Supports clock failure detection for high/low speed external crystal oscillator
– Supports exception (NMI) generation once a clock failure detected
– Supports clock output
Digital Microphone (DMIC)
– Supports up to four digital microphones.
– Provides one 32-level FIFO data buffers for receiving.
– Generates interrupt requests when buffer levels cross a programmable boundary.
– Supports PDMA transfer.
Differential Audio PWM Output (DPWM)
– Supports left channel, right channels and sub-woofer channel.
– Supports sample rate from 16~96 kHz
– Programmable biquad filter with 10 band.
– PDMA data channel for streaming of PCM audio data.
– Supports the single precision floating point for input data and BIQ coefficient.
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