Nokia RH-41 Series Troubleshooting Instructions page 7

CCS Technical Documentation
• Reset releasing
• The UPP releases the SLEEPX up to the "non sleep" -state to prevent the
2 MCU starts running the Bootsrap Code
• Written in stone/ UPP internal ROM
• The program checks if there is any reason for the FDL mode (Flash Down Load)
• If there is an executable code in FLASH and there is no reason for FDL, the MCU
starts running the MCU program from FLASH.
3 MCU runs the FLASH MCU code
• The phone initialization, user interfaces, internal blocks etc.
• Core regulator voltage setting for required DSP speed
• Initializes the DSP and concerning HW
• Releases DSP reset -> DSP starts running
Note: In the following figure, the RF_Clk frequency appears to be lower than 19.44 MHz because of a
too low oscilloscope sampling frequency (2kS/s).
Issue 2 09/2003
UEM switching the regulators "OFF"
Figure 1: Power up sequence
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Troubleshooting Instructions
Confidential
RH-41
Page 7