Cirrus Logic CS485 Series User Manual page 78

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7.2 Configuring the Crystal Oscillator
After code download or soft reset, and before kickstarting the application, the host has the option of
changing the default hardware configuration. (Please see AN298, "CS485xx Firmware User's Manual" for
more information on kickstarting). In general, the hardware configuration can only be changed immediately
after download or after soft reset.
Hardware configuration messages are used to configure the XTAL_OUT divider.
7.2.1 Crystal Oscillator Hardware Configuration Messages
Table 7-2 shows the command for configuring the XTAL_OUT pin for Divide-by-2 operation.
DS734UM7
1 Meg
X1
C1 C1
Figure 7-1. Crystal Oscillator Schematic
Table 7-2. XTAL_OUT Configuration
Description
XTAL_OUT Divide-by-2
Copyright 2008 Cirrus Logic, Inc.
XTAL_OUT
XTO
XTI
Hex Message
0x81400042
0x00000800
§§
Configuring the Crystal Oscillator
CS485xx Hardware User's Manual
CS485xx
7-2