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LGE Internal Use Only
Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
3. Technical brief
E. Low Frequency Clock Interface
The low-frequency clock signal (RTCCLK) is used by the Bluetooth module as a low-power
clock. The clock is used in different Bluetooth modes, like sniff and park, to have a correct
timing on the Bluetooth air interface without having the master clock running.
D. Master Clock and Clock Request Interface
The master clock (MCLK) is a 26 MHz signal used as the high precision clock signal for the
Bluetooth module. The signal can be switched on and off by the platform. The master clock
request (CLKREQ) is used by the Bluetooth module to ask for the master clock.
If the Bluetooth module asserts the signal high, it gets the master clock. The other
alternative for the Bluetooth module is to set the clock request output to high impedance
state, indicating that it does not need the master clock. The Bluetooth module receives the
master clock, if other parts of the chipset request it.
