Nokia NSE–3 SERIES Service Manual page 40

NSE–3
System Module
The MAD2 operates from a 13 MHz system clock, which is generated
from the 13Mhz VCXO frequency. The MAD2 supplies a 6,5MHz or a
13MHz internal clock for the MCU and system logic blocks and a 13MHz
clock for the DSP, where it is multiplied to 52 MHz DSP clock. The system
clock can be stopped for a system sleep mode by disabling the VCXO
supply power from the CCONT regulator output. The CCONT provides a
32kHz sleep clock for internal use and to the MAD2, which is used for the
sleep mode timing. The sleep clock is active when there is a battery volt-
age available i.e. always when the battery is connected.
Pin Pin Name
N:o
1 MCUGenOut5
2 MCUGenOut4
3 LEADGND
4 MCUGenOut3
5 VCC
6 MCUGenOut2
7 MCUGenOut1
8 MCUGenOut0
9 Col4
Page 3 – 34
– CODER (Block encoding/decoding and A51&A52 ciphering)
– AccIF(Accessory Interface)
– SCU (Synthesizer Control Unit for controlling 2 separate
synthesizer)
– UIF (Keyboard interface, serial control interface for COBBA
PCM Codec, LCD Driver and CCONT)
– SIMI (SimCard interface with enhanched features)
– PUP (Parallel IO, USART and PWM control unit for vibra
and buzzer)
Pin Connected Drive
Type to/from req.
O Audio
O N101
O
O
O MCU
memory
O
I/O UIF
Technical Documentation
Reset Note
State
mA
2 0
2 0
2 0
IO VCC in
3325c10
2 0
2 0
2 1 LoByteSelX
in 16–bit
mode
2 Input program-
mable pullup
PR0201
PAMS
Explanation
MCU General
purpose output
port
MCU General
purpose output
port
Lead Ground
MCU General
purpose output
port
Power
MCU General
purpose output
port
MCU General
purpose output
port
MCU General
purpose output
port
I/O line for key-
board column 4
Original 11/97