6 i2c control source menu, 6 i2c control source menu -12 – Cirrus Logic CRD48L10 User Manual
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12
3.2 MCU UI Controlled
The following are menu choices under Clock Source:
•
Default 12.288 MHz oscillator
•
CLK IN header TP4
•
TP4 supports voltages from +1.8 V to +5 V.
•
A shunt must be installed on TP30 only when using TP4.
3.2.6
I
2
C Control Source Menu
An I
2
C bus is used to configure the CS42L73 codec, S/PDIF Rx, and S/PDIF Tx. By default, the MCU configures all
components on the board for data flow selected. If the user chooses EXT MCU, then the local C8051 releases the I
2
C bus,
and the external MCU is completely responsible for configuring the board.
Figure 3-28. I
2
C Control Source Menu
Menu choices under I
2
C Ctrl Source:
•
On-board MCU
•
EXT (–SPDIF)—Buffer U23 is tristated by on-board MCU.
•
EXT (+SPDIF)—Buffer U23 is enabled by on-board MCU, providing S/PDIF audio to CS48L10.