User's Manual

NEMO Bluetooth Radio Module
Solutions for a Real Time World Datasheet
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Copyright Unigen Corporation, 2008
The equation below describes the PCM CLK frequency when being generated using the internal
48MHz clock:
The frequency of the PCM SYNC relative to the PCM CLK is set using either of the two equations
below by setting the value of PCM_SYNC_MULT (see Table 10.4):
CNT_RATE, CNT_LIMIT and SYNC_LIMIT are set using PSKEY_PCM_LOW_JITTER_CONFIG. As an
example, to generate BT_PCM_CLK_P at 512kHz with BT_PCM_SYNC_P at 8kHz, set
PSKEY_PCM_LOW_JITTER_CONFIG to 0x08080177.
PCM Configuration
The PCM configuration is set using the PS Keys, PSKEY_PCM_CONFIG32 described in Table 10.4
and PSKEY_PCM_LOW_JITTER_CONFIG in Table 10.3. The default for PSKEY_PCM_CONFIG32 is
0x00800000, i.e., first slot following sync is active, 13-bit linear voice format, long frame sync and
interface master generating 256kHz PCM_CLK from 4MHz internal clock with no tri-state of
PCM_OUT. For more information in regards to PS keys and their usage refer to the Persistent
Store section of this document.