Nokia 9210i Servicehandbuch

PAMS

Technical Documentation

RAE-5 

3. RF+System Module KL8 

Page 3 – 24

Issue 1 04/02

There are three main operation modes in the system when power is on: 
– Running
– Idle
– Deep Sleep

Note that phone can be either on or off in each of power on states.

Figure 3.

Basic Operation Modes of RAE-5 (simplified scheme)

Idle

Running

Deep Sleep

Deep Sleep conditions met

No tasks to run

Power OFF

Reset

Power Up

(VCXO ON)

(VCXO ON)

(VCXO OFF)

Battery voltage

Interrupt

Interrupt

Too low 

Battery

voltage

or

Battery

removed

high enough

Power saving modes are entered under SW control. Returning to running mode
is activated by interrupt (generated internally by MADLinda or from CCONT).

The 26MHz main clock frequency is generated by the  VCTCXO located in the
RF section. This clock is divide in HAGAR to 13MHz.  Clock signal is buffered
to low level sine wave clock signal (RFC) and fed to system HW side. There it
is connected to MADLinda clock input. The MPU within MADLinda can stop the
clock by shutting off the VCTCXO’s supply voltage (VXO) via CCONT.

The CCONT provides a 32kHz sleep clock generated from 32.768kHz quartz
crystal. This clock signal is used internally in CCONT to run the RTC and
routed to MADLinda (SLEEPCLK). Sleep clock is used to run MADLinda when
the main clock is shut down. A backup battery keeps the RTC running if the
main battery is disconnected.

Other clock signals are generated inside MADLinda using PLLs and clock divid-
ers which are controlled by SW. The maximum clock frequency in the MPU side
is 52MHz and in the DSP side 78MHz.