Nokia 2608 Service Manual page 101

RM-376
System Module and User Interface
SBI CLK Interface
A 9.6 MHz clock signal is used for DBUS, which is used by the MSM to transfer data between the PM and MSM.
Figure 13 MSM to PM SBI Timing at 25P C
0P
The system clock is stopped during sleep mode by disabling the VREG_TCXO. The TCXO is turned off by the PM
regulator, which is from MSM's TCXO_EN output signal.
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